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Zeitschriftenartikel zum Thema "Pearson Correlation Coefficient 13"
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Mo, Ruping, Chengzhi Ye und Paul H. Whitfield. „Application Potential of Four Nontraditional Similarity Metrics in Hydrometeorology“. Journal of Hydrometeorology 15, Nr. 5 (25.09.2014): 1862–80. http://dx.doi.org/10.1175/jhm-d-13-0140.1.
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Abstract This paper presents a review and assessment of four nontraditional similarity metrics that can be applied to hydrological and meteorological data. These metrics are 1) the uncentered correlation coefficient, 2) the Hodgkin–Richards index, 3) the Petke index, and 4) the Wang–Bovik index. The first metric has been widely used in hydrometeorology, and the other three have been proposed in other disciplines for similarity analysis. It is demonstrated that these similarity metrics, in their original formulations, either do not actually have the purported advantage over the traditional Pearson correlation coefficient or are not suitable for some hydrometeorological applications. They are reformulated in this study to address these deficiencies. The resulting modified metrics are unitless, bounded, and proportional to the Pearson correlation coefficient, and three of them have the confirmed advantage of explicitly penalizing for differences in the mean and/or in the variance. Two application examples are used to demonstrate the applicability of these similarity metrics in hydrometeorology. A metavalidation model and a graphical tool (Taylor diagram) are used to evaluate the performances of these similarity metrics. In a case study of analog analysis, the Wang–Bovik index stands out as the best metric for simulation of the human perception of similarity between two-dimensional patterns, whereas the modified Petke index and the traditional root-mean-square distance may perform slightly better than the others in the regions with a very large difference between the variances.
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Ud Din, Siraj, Syed Adil Hayat, Pukraj Ud Din, Abdul Qadir, Mohib Shah, Tabassum Yaseen, Farrukh Hussain und Ibrahim Khan. „Quantitative Ethnobotany of the Plants of District Swabi, Tehsil Razar, Khyber Pakhtunkhwa, Pakistan“. Journal of Agriculture Sustainability and Environment 3, Nr. 1 (29.06.2024): 78–92. https://doi.org/10.56556/jase.v3i1.1123.
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The present study presents first tentative attempt to determine the quantitative ethnobotanical profile of plants of Tehsil Razar, District Swabi. Relative frequency citation (RFC) and Use value (UV) of plant resources were calculated. Pearson correlation coefficient (PCC) was calculated to find any significance between RFC and UV. A total of 60 plants from 37 families had ethnobotanical importance in the investigated area. It included 1 pteridophyte, 13 monocots and 46 dicots. Quantitative results showed that 24 species with the highest RFC value of 1, were important in the area in terms of their uses. Acacia modesta, Acacia nilotica sub sp. nilotica and Ailanthus altissima were popular and common medicinal plants in the study area with highest use value of 6.07, 5.60 and 3.40 respectively. The Pearson correlation coefficient (PCC) between RFC and UV was 0.01 with P value well below than 1% which demonstrate a highly significant correlation between RFC and UV.
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Rodríguez, Monica M., Humberto Méndez, Benjamín Torún, Dirk Schroeder und Aryeh D. Stein. „Validation of a semi-quantitative food-frequency questionnaire for use among adults in Guatemala“. Public Health Nutrition 5, Nr. 5 (Oktober 2002): 691–98. http://dx.doi.org/10.1079/phn2002333.
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AbstractObjective:The purpose of the study was to assess the validity of a 52-item semiquantitative food-frequency questionnaire (FFQ) by comparing it with multiple 24-hour dietary recalls.Design:Three non-consecutive 24-hour dietary recalls and one FFQ were administered over a one-month period.Setting:Four communities of El Progreso, Guatemala.Subjects:Seventy-three individuals aged 22–55 years.Results:Intakes of energy and other nutrients as measured by the FFQ were higher than intakes measured by 24-hour recalls. Energy was overestimated by 361 kcal, and nutrient overestimates were particularly great for vitamin C and iron. Pearson correlation coefficients for crude energy and nutrients intakes ranged from 0.64 for energy to 0.12 for vitamin C. Exact agreement for both methods (measured by the concordance correlation coefficient) ranged from 0.59 (fat) to 0.06 (vitamin C). Pearson correlation coefficients for energy-adjusted nutrients ranged from 0.59 (carbohydrates) to 0.11 (thiamin). Pearson correlation coefficients for the proportion of total energy derived from specific foods ranged from 0.59 (tortillas) to 0.01 (sugared beverages). Cross-classification of quartiles of crude nutrient intakes for both methods indicated that <11% were grossly misclassified; after adjusting for energy intake, <13% were grossly misclassified.Conclusions:This FFQ provides good measures of energy and macronutrient intakes and a reasonably reliable measure of micronutrient intake, indicating its suitability for comparing exposures within a study population in reference to heath-related endpoints. Our results highlight the need to adapt any FFQ to specific cultural needs – in this case, the Guatemalan ‘core foods’ (tortilla, bread and beans), for which inter-individual variability in intake is high.
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Jiskrová, I., D. Misař und S. Svobodová. „Comparison of the performance and precocity of winners of the most important european classic races“. Czech Journal of Animal Science 49, No. 2 (12.12.2011): 86–92. http://dx.doi.org/10.17221/4284-cjas.
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Racing performance of winners of European classic races and of two-year-old horses was compared on the basis of two classic races: 1 600–1 609 m (one mile) and 2 100–2 414 m (derby). The horses included in our comparisons were winners of classic races held in England, France and Ireland in 1993–2002. The performance of the winners of classic races was based on the international classification of the performance of three-year-old horses (Classifications internationales) in kg and lb (rating) and used as the characteristics of performance. Comparisons of the correlations between the performance of winners of the most important classic races and their performance rating as two-year-olds were based on the results of 126 winners of 13 classic races. We calculated Pearson’s correlation. The correlation coefficients of all the groups concerned were low (r = 0.109–0.325). The correlation coefficient of racing performances was significant (P < 0.05) only in the classic mile mare race.
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Green, Daniel M., Mingjuan Wang, Matthew J. Krasin, Andrew M. Davidoff, DeoKumar Srivastava, Dennis W. Jay, Kirsten K. Ness et al. „Abstract 6381: Long-term kidney function after treatment for unilateral, non-metastatic, non-syndromic Wilms tumor. A report from the St. Jude Lifetime Cohort Study“. Cancer Research 84, Nr. 6_Supplement (22.03.2024): 6381. http://dx.doi.org/10.1158/1538-7445.am2024-6381.
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Abstract Background: We previously reported that the estimated glomerular filtration rate (eGFR) was decreased among survivors of unilateral, non-metastatic, non-syndromic Wilms tumor (WT) treated with whole abdomen radiation therapy (WART) compared to controls, but not compared to unirradiated WT survivors (Pediatr Blood Cancer 2020;67:e28271). The impact of sex on estimates of kidney function among adult survivors of WT has not been well-documented. Methods: We clinically evaluated male and female WT survivors with creatinine and cystatin C, calculated eGFR using the Chronic Kidney Disease - Epidemiology (CKD-EPI) equations with and without cystatin C and measured 99mTc diethylenetriamine pentaacetic acid (DTPA) plasma clearance. WT survivors consisted of 20 treated with unilateral nephrectomy (UN), non-nephrotoxic chemotherapy (NNC) and whole abdomen radiation therapy (WART) (mean - 20.2 Gray (Gy); standard deviation (SD) - 9.12 Gy), and 20 treated with UN, no radiation therapy, and NNC. Correlations between 99mTc DTPA clearance and eGFR were calculated. Results: Among female WT survivors, none of the eGFR calculations was statistically significantly correlated with 99mTc DTPA clearance. Among male WT survivors, 99mTc DTPA clearance correlated well with eGFR calculations that included creatinine. Results are shown in the Table. Conclusions: Among female survivors of unilateral, non-metastatic, non-syndromic WT who have undergone UN, eGFR is poorly correlated with 99mTc DTPA clearance. Evaluation of treatment-related changes in body composition may provide insight into these results. Correlation between eGFR and 99mTc DTPA clearance Females eGFR(CKD-EPI) 99mTc DTPA clearance No radiation therapy (n=13) Whole abdomen radiation therapy(n=12) Pearson correlation coefficient p-value Pearson correlation coefficient p-value Creatinine only 0.109 0.723 -0.295 0.352 Cystatin C only 0.311 0.301 0.094 0.782 Creatinine and cystatin C 0.348 0.244 -0.028 0.935 Males No radiation therapy (n=6) Whole abdomen radiation therapy(n=6) Pearson correlation coefficient p-value Pearson correlation coefficient p-value Creatinine only 0.827 0.043 0.859 0.028 Cystatin C only 0.811 0.050 0.592 0.216 Creatinine and cystatin C 0.878 0.021 0.866 0.026 Citation Format: Daniel M. Green, Mingjuan Wang, Matthew J. Krasin, Andrew M. Davidoff, DeoKumar Srivastava, Dennis W. Jay, Kirsten K. Ness, Barry L. Shulkin, Jennifer Q. Lanctot, Kyla C. Shelton, Rachel C. Brennan, Matthew J. Ehrhardt, Stephanie Dixon, Beth A. Kurt, Leslie L. Robison, Melissa M. Hudson, Sheri L. Spunt. Long-term kidney function after treatment for unilateral, non-metastatic, non-syndromic Wilms tumor. A report from the St. Jude Lifetime Cohort Study [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 6381.
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Chan, Ka Lok, Matthias Wiegner, Jos van Geffen, Isabelle De Smedt, Carlos Alberti, Zhibin Cheng, Sheng Ye und Mark Wenig. „MAX-DOAS measurements of tropospheric NO<sub>2</sub> and HCHO in Munich and the comparison to OMI and TROPOMI satellite observations“. Atmospheric Measurement Techniques 13, Nr. 8 (19.08.2020): 4499–520. http://dx.doi.org/10.5194/amt-13-4499-2020.
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Abstract. We present two-dimensional scanning Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations of nitrogen dioxide (NO2) and formaldehyde (HCHO) in Munich. Vertical columns and vertical distribution profiles of aerosol extinction coefficient, NO2 and HCHO are retrieved from the 2D MAX-DOAS observations. The measured surface aerosol extinction coefficients and NO2 mixing ratios derived from the retrieved profiles are compared to in situ monitoring data, and the surface NO2 mixing ratios show a good agreement with in situ monitoring data with a Pearson correlation coefficient (R) of 0.91. The aerosol optical depths (AODs) show good agreement as well (R = 0.80) when compared to sun photometer measurements. Tropospheric vertical column densities (VCDs) of NO2 and HCHO derived from the MAX-DOAS measurements are also used to validate Ozone Monitoring Instrument (OMI) and TROPOspheric Monitoring Instrument (TROPOMI) satellite observations. Monthly averaged data show a good correlation; however, satellite observations are on average 30 % lower than the MAX-DOAS measurements. Furthermore, the MAX-DOAS observations are used to investigate the spatiotemporal characteristic of NO2 and HCHO in Munich. Analysis of the relations between aerosol, NO2 and HCHO shows higher aerosol-to-HCHO ratios in winter, which reflects a longer atmospheric lifetime of secondary aerosol and HCHO during winter. The analysis also suggests that secondary aerosol formation is the major source of these aerosols in Munich.
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Mohammed, Abubakar Kandi, Idris Ibrahim Ozigis und Nasir Muhammad Lawal. „Comparative Analysis of Gas-Turbine Engine Diagnostics through Compressor Wash Wastewater Parameter Monitoring for Geregu Gas-Turbine Power Plant“. ABUAD Journal of Engineering Research and Development (AJERD) 6, Nr. 2 (12.12.2023): 192–204. http://dx.doi.org/10.53982/ajerd.2023.0602.19-j.
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This paper focuses on finding a lasting solution to the reason why offline compressor washing of unit 13 at Geregu Power plc in Ajaokuta does not restore power output lost due to fouling back to the rated output, as is the case for the other two (2) units in the plant and for several reported cases published in the literature. Monitoring of parameters closely related to the power output was carried out to find out the root causes for the low output recovery after offline compressor wash and came up with a successful diagnosis by interrelating GT13 wash effluent test results of parameters like conductivity, turbidity, and heavy metal concentration with parameters of two (2) other turbines in the plant. Using statistical tools like the mean and Pearson correlation coefficient for the four-year period, the mean comparative result indicates that the conductivity of GT13 was higher than that of GT11 and GT12 by 50% and 79%, respectively. The turbidity of GT13 was 570% and 700% higher than that of GT11 and GT12. The Pearson correlation coefficients of GT13 effluent conductivity, turbidity, and silica content relative to the power output recovery after wash were (-89.2%), (-64.4%), and (-77.3%), respectively, and the covariance of each of the three parameters relative to one another was high. Effluent Ph as a factor was discarded based on its 0% linear correlation coefficient with the output. The conclusion reached is that the co-linear relationship between conductivity, silica content, and effluent turbidity is responsible for GT13's low output recovery after the wash.
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Demajosita, Yulinda Nurfit, I. Made Putrawan und Diana Vivanti. „Correlation between Teacher Instructional Leadership with Students New Environmental Paradigm (Studies Correlational In SMA Negeri 13 Jakarta)“. IJEEM - Indonesian Journal of Environmental Education and Management 3, Nr. 2 (28.07.2018): 115–20. http://dx.doi.org/10.21009/ijeem.032.02.
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The environmental crisis that occurred allegedly derived from human mistakes perspective about himself against nature. Therefore, we need a new perspective or paradigm of the environment or the New Environmental Paradigm (NEP). To change the way students to be more environmentalism based on NEP, teachers need to integrate the knowledge and attitude of the environment through the influencing process of instructional leadership held by teachers. The purpose of this study was to determine the relationship between teachers Instructional Leadership with New Environmental Paradigm (NEP) students in high school. This research was conducted in SMA Negeri 13 Jakarta in April 2016. This type of research is quantitative with survey method through correlational studies. The subjects were students of class X Science with a total sample of 130 students were selected by simple random sampling. Result of the normality data tested by Kolmogorov-Smirnov test, resulting that two data population normality distributed. Data homogeneity tested by Bartlett test, resulting data obtained from both homogeneous variables. Hypothesis test using regression test, found that the regression model Ŷ = 120.839+ 0.238X had a significant and linear relationship. Pearson Product Moment test results obtained by the correlation value of 0.323. The calculation of the coefficient of determination obtained value of 0.108, which means teachers instructional leadership contributed to the students new environmental paradigm by 10.8%, while 89.2% were caused by other factors.
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Stern, Biljana, Gregor Socan, Ksenija Rener-Sitar, Andreja Kukec und Lijana Zaletel-Kragelj. „Validation of the Slovenian version of short sense of coherence questionnaire (SOC-13) in multiple sclerosis patients“. Slovenian Journal of Public Health 58, Nr. 1 (21.01.2019): 31–39. http://dx.doi.org/10.2478/sjph-2019-0004.
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Abstract Aim To validate the Slovenian version (SOC-13-SVN) of Sense of Coherence 13-item instrument (SOC-13) in Slovenian multiple sclerosis (MS) patients. Methods A consecutive 134 Slovenian MS patients were enrolled in a cross-sectional study in 2013. The reliability of the SOC-13-SVN was assessed for internal consistency by Cronbach’s alpha coefficient (α), dimensionality by the confirmatory factor analysis (CFA), and criterion validity by Pearson correlation coefficient (r) between SOC-13-SVN global score and MSQOL-54 composite scores – Mental Health Composite score (MHC) and Physical Health Composite score (PHC). Results For the SOC-13-SVN instrument as a whole, internal consistency was high (αtotal=0.88) while it was low for three subscales (αcomprehensibility=0.79; αmanageability=0.66; αmeaningfulness=0.69). The results of the CFA confirmed a three-factor structure with good fit (RMSEA=0.059, CFI=0.953, SRMR=0.065), however, the correlations between the factors were very high (rcomprehensibility/manageability=0.938; rcomprehensibility/meaningfulness=0.811; rmanageability/meaningfulness=0.930). The criterion validity analysis showed a moderate positive strength of relationship between SOC-13-SVN global score and both MSQOL-54 composite scores (MHC: r=0.597, p<0.001; PHC: r=0.437, p<0.001). Conclusion Analysis of some psychometric properties confirmed that this instrument is a reliable and valid tool for use in Slovenian MS patients. Despite the three-dimensional structure of the instrument, the use of the global summary score is encouraged due to the low reliability of the subscale scores and high correlations between them.
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Lorenz, Douglas J., Steven Levy und Somnath Datta. „Inferring marginal association with paired and unpaired clustered data“. Statistical Methods in Medical Research 27, Nr. 6 (20.09.2016): 1806–17. http://dx.doi.org/10.1177/0962280216669184.
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In the marginal analysis of clustered data, where the marginal distribution of interest is that of a typical observation within a typical cluster, analysis by reweighting has been introduced as a useful tool for estimating parameters of these marginal distributions. Such reweighting methods have foundation in within-cluster resampling schemes that marginalize potential informativeness due to cluster size or within-cluster covariate distribution, to which reweighting methods are asymptotically equivalent. In this paper, we introduce a reweighting scheme for the marginal analysis of clustered data that generalizes prior reweighting methods, with a particular application to measuring bivariate correlation in unpaired clustered data, in which observations of two random variables are not naturally paired at the within-cluster level. We develop unpaired clustered data analogs of well-known product moment correlation coefficients (Pearson, Spearman, phi), as well as the polyserial coefficient for measuring correlation between one discrete and one continuous variable. We evaluate the performance of these coefficients via a simulation study and demonstrate their use by finding no statistically significant association between dental caries at an early age and dental fluorosis at age 13 using a large dental dataset.
Dissertationen zum Thema "Pearson Correlation Coefficient 13"
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Al, Samrout Marwa. „Approches mono et bi-objective pour l'optimisation intégrée des postes d'amarrage et des grues de quai dans les opérations de transbordement“. Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH21.
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Le transport maritime international est vital pour le commerce mondial, représentant plus de 85 % des échanges, avec 10,5 milliards de tonnes transportées chaque année. Ce mode de transport est le plus économique et durable, contribuant seulement à 2,6 % des émissions de CO2. En France, le secteur maritime représente 1,5 % du PIB et près de 525 000 emplois. Les ports maritimes, cruciaux pour la chaîne logistique, facilitent le transbordement des marchandises et adoptent de plus en plus des solutions numériques basées sur l'intelligence artificielle pour améliorer leur efficacité. La France compte onze Grands ports maritimes, dont sept en Métropole. La thèse se concentre sur l’optimisation des terminaux à conteneurs pour améliorer l’efficacité et la performance des ports.Ce mémoire aborde la problématique de la planification des postes d’accostage et de l’activation des portiques dans les terminaux à conteneurs des ports maritimes, en réponse aux changements récents dans la logistique maritime, tels que l’arrivée de méga-navires et l’automatisation. Il souligne les lacunes dans la littérature existante et propose une analyse approfondie des défis actuels. Le document se divise en trois chapitres : Le premier chapitre explore l’histoire de la conteneurisation, les types de conteneurs, et les défis de la planification opérationnelle. Il se concentre sur le problème d’attribution des postes d’amarrage (BAP), ses méthodes de résolution et l’intégration de l’intelligence artificielle (IA) pour optimiser les processus logistiques. Le 2ème chapitre introduit le problème d'allocation dynamique avec transbordement ship-to-ship. Il propose un programme linéaire en nombres entiers mixtes (MILP) pour optimiser l’ordonnancement d’accostage et le transbordement entre navires. L’objectif est de réduire les temps de séjour des navires dans le terminal, ainsi que les pénalités dues aux retards des navires, et de décider du mode de transbordement nécessaire. La méthode combine une heuristique de type packing et un algorithme génétique amélioré, démontrant une efficacité dans la réduction des temps de séjour des navires. Nous avons effectué une analyse statistique pour identifier les paramètres de contrôle efficaces du GA, puis nous avons appliqué cet algorithme avec les paramètres de contrôle déterminés pour réaliser des expériences numériques sur des instances générées aléatoirement. De plus, nous avons réalisé une étude comparative afin d’évaluer différents opérateurs de croisement, en utilisant le test d’analyse de variance (ANOVA). Ensuite, nous avons présenté une série d’exemples basés sur des données aléatoires, résolus à l’aide du solveur CPLEX, afin de confirmer la validité du modèle proposé. La méthode proposée est capable de résoudre le problème dans un temps de calcul acceptable pour des instances de taille moyenne et grande. Le dernier chapitre présente un problème intégré d’allocation des postes d’amarrage et des grues, avec un focus sur le transbordement ship-to-ship. Trois approches sont proposées . La première approche utilise l'algorithme génétique NSGA-III, complété par une analyse statistique pour optimiser les paramètres et évaluer différents opérateurs de croisement. En analysant des données de la base AIS, des tests numériques montrent l’efficacité de cette méthode au port du Havre, avec des résultats satisfaisants et un temps de calcul raisonnable.La deuxième approche implique deux modèles de régression, Gradient Boosting Regression (GBR) et Random Forest Regression (RFR), entraînés sur des caractéristiques sélectionnées. La méthodologie inclut des étapes de prétraitement et l'optimisation des hyperparamètres. Bien que NSGA-III offre la meilleure précision, il nécessite un temps d'exécution plus long. En revanche, GBR et RFR, bien que légèrement moins précis, améliorent l’efficacité, soulignant le compromis entre précision et temps d'exécution dans les applications pratiquesInternational maritime transport is vital for global trade, representing over 85% of exchanges, with 10.5 billion tons transported each year. This mode of transport is the most economical and sustainable, contributing only 2.6% of CO2 emissions. In France, the maritime sector accounts for 1.5% of GDP and nearly 525,000 jobs. Maritime ports, crucial for the logistics chain, facilitate the transshipment of goods and increasingly adopt digital solutions based on artificial intelligence to improve their efficiency. France has eleven major seaports, seven of which are located in mainland France.The thesis focuses on optimizing container terminals to enhance the efficiency and performance of ports. It addresses the issues of berth allocation planning and crane activation in container terminals in response to recent changes in maritime logistics, such as the arrival of mega-ships and automation. It highlights gaps in the existing literature and offers an in-depth analysis of current challenges. The document is divided into three chapters:The first chapter explores the history of containerization, types of containers, and challenges in operational planning. It focuses on the berth allocation problem (BAP), its resolution methods, and the integration of artificial intelligence (AI) to optimize logistical processes. The second chapter introduces the dynamic allocation problem with ship-to-ship transshipment. It proposes a mixed-integer linear program (MILP) to optimize the berthing schedule and transshipment between vessels. The objective is to reduce vessel stay times in the terminal, as well as penalties due to vessel delays, and to determine the necessary transshipment method. The method combines a packing-type heuristic and an improved genetic algorithm, demonstrating effectiveness in reducing vessel stay times. We conducted a statistical analysis to identify effective control parameters for the GA, then applied this algorithm with the determined control parameters to perform numerical experiments on randomly generated instances. Additionally, we conducted a comparative study to evaluate different crossover operators using ANOVA. We then presented a series of examples based on random data, solved using the CPLEX solver, to confirm the validity of the proposed model. The proposed method is capable of solving the problem in an acceptable computation time for medium and large instances. The final chapter presents an integrated berth and crane allocation problem, focusing on ship-to-ship transshipment. Three approaches are proposed. The first approach uses the NSGA-III genetic algorithm, supplemented by a statistical analysis to optimize parameters and evaluate different crossover operators. By analyzing AIS database data, numerical tests demonstrate the effectiveness of this method at the port of Le Havre, yielding satisfactory results within a reasonable computation time. The second approach involves two regression models, Gradient Boosting Regression (GBR) and Random Forest Regression (RFR), trained on selected features. The methodology includes preprocessing steps and hyperparameter optimization. While NSGA-III achieves the highest accuracy, it requires a longer execution time. In contrast, although GBR and RFR are slightly less precise, they significantly improve efficiency, highlighting the trade-off between accuracy and execution time in practical applications
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Kalaitzis, Angelos. „Bitcoin - Monero analysis: Pearson and Spearman correlation coefficients of cryptocurrencies“. Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-41402.
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In this thesis, an analysis of Bitcoin, Monero price and volatility is conducted with respect to S&P500 and the VIX index. Moreover using Python, we computed correlation coefficients of nine cryptocurrencies with two different approaches: Pearson and Spearman from July 2016 -July 2018. Moreover the Pearson correlation coefficient was computed for each year from July2016 - July 2017 - July 2018. It has been concluded that in 2016 the correlation between the selected cryptocurrencies was very weak - almost none, but in 2017 the correlation increased and became moderate positive. In 2018, almost all of the cryptocurrencies were highly correlated. For example, from January until July of 2018, the Bitcoin - Monero correlation was 0.86 and Bitcoin - Ethereum was 0.82.
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Bergamaschi, Denise Pimentel. „Correlação intraclasse de Pearson para pares repetidos: comparação entre dois estimadores“. Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/6/6132/tde-01102014-105050/.
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Objetivo. Comparar, teórica e empiricamente, dois estimadores do coeficiente de correlação intraclasse momento-produto de Pearson para pares repetidos Pi. O primeiro é o estimador \"natural\", obtido mediante a correlação momento-produto de Pearson para membros de uma mesma classe (rI) e o segundo, obtido como função de componentes de variância (icc). Métodos. Comparação teórica e empírica dos parâmetros e estimadores. A comparação teórica envolve duas definições do coeficiente de correlação intraclasse PI como medida de confiabilidade (*), para o caso de duas réplicas, assim como uma apresentação da técnica de análise de variância e a definição e interpretação dos estimadores ri e icc. A comparação empírica é realizada mediante um estudo de simulação Monte Carlo com a geração de pares de valores correlacionados segundo o coeficiente de correlação intraclasse, momento-produto de Pearson para pares repetidos. Os pares de valores são distribuídos segundo uma distribuição Normal bivariada, com valores do tamanho da amostra e da correlação intraclasse previamente fixados em: n= 15, 30 e 45 e pI = {O; 0,15; 0,30; 0,45; 0,60; 0,75; 0,9}. Resultados. Comparando-se o vício e o erro quadrático médio dos estimadores, bem como as amplitudes dos intervalos de confiança, tem-se como resultado que o vício de icc foi sempre menor que o vício de rI, mesmo ocorrendo com o erro quadrático médio. Conclusões. O icc é um estimador melhor, principalmente para n pequeno (por exemplo 15). Para valores maiores de n (30 ou mais), os estimadores produzem resultados iguais até a segunda casa decimal.Objective. This thesis presents and compares, theoretically and empirically, two estimators of the intraclass correlation coefficient pI, defined as Pearson\'s pairwise intraclass correlation coefficient. The first is the \"natural\" estimator, obtained by Pearson\'s moment-product correlation for members of one class (rI) while the second was obtained as a function of components of variance (icc). Methods. Theoretical and empirical comparison of the parameters and estimators are performed. The theoretical comparison involves two definitions of the intrac1ass correlation coefficient pI as a measure of reliability (*) for two repeated measurements in the same class and the presentation of the technique of analysis of variance, as well as for the definition and interpretation of the estimators ri and icc. The empirical comparison was carried out by means of a Monte Carlo simulation study of pairs of correlated values according Pearson\'s pairwise correlation. The pairs of values follow a normal bivariate distribution, with correlation values and sample size previously fixed: n= 15, 30 e 45 and Pl = . Results. Bias and mean square error for the estimators were compared as well as the range of the intervals of confidence. The comparison shows that the bias of icc is always smaller than of rI This also applies to the mean square error. Conclusions. The icc is a better estimator, especially for n less than or equal to 15. For larger samples sízes (n 30 or more), the estimators produce results that are equal to the second decimal place. (*) Fórmula
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Truong, Thi Kim Tien. „Grandes déviations précises pour des statistiques de test“. Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2057/document.
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Cette thèse concerne l’étude de grandes déviations précises pour deux statistiques de test:le coefficient de corrélation empirique de Pearson et la statistique de Moran.Les deux premiers chapitres sont consacrés à des rappels sur les grandes déviations précises et sur la méthode de Laplace qui seront utilisés par la suite. Par la suite, nous étudions les grandes déviations précises pour des coefficients de Pearson empiriques qui sont définis par:$r_n=\sum_{i=1}^n(X_i-\bar X_n)(Y_i-\bar Y_n)/\sqrt{\sum_{i=1}(X_i-\bar X_n)^2 \sum_{i=1}(Y_i-\bar Y_n)^2}$ ou, quand les espérances sont connues, $\tilde r_n=\sum_{i=1}^n(X_i-\mathbb E(X))(Y_i-\mathbb E(Y))/\sqrt{\sum_{i=1}(X_i-\mathbb E(X))^2 \sum_{i=1}(Y_i-\mathbb E(Y))^2} \, .$. Notre cadre est celui d’échantillons (Xi, Yi) ayant une distribution sphérique ou une distribution gaussienne. Dans chaque cas, le schéma de preuve suit celui de Bercu et al.Par la suite, nous considérons la statistique de Moran $T_n=\frac{1}{n}\sum_{k=1}^n\log\frac{X_i}{\bar X_n}+\gamma \, ,$o\`u $\gamma$, où γ est la constante d’ Euler. Enfin l’appendice est consacré aux preuves de résultats techniquesThis thesis focuses on the study of Sharp large deviations (SLD) for two test statistics:the Pearson’s empirical correlation coefficient and the Moran statistic.The two first chapters aim to recall general results on SLD principles and Laplace’s methodsused in the sequel. Then we study the SLD of empirical Pearson coefficients, name $r_n=\sum_{i=1}^n(X_i-\bar X_n)(Y_i-\bar Y_n)/\sqrt{\sum_{i=1}(X_i-\bar X_n)^2 \sum_{i=1}(Y_i-\bar Y_n)^2}$ and when the meansare known,$\tilde r_n=\sum_{i=1}^n(X_i-\mathbb E(X))(Y_i-\mathbb E(Y))/\sqrt{\sum_{i=1}(X_i-\mathbb E(X))^2 \sum_{i=1}(Y_i-\mathbb E(Y))^2} \, .$ .Our framework takes place in two cases of random sample (Xi, Yi): spherical distributionand Gaussian distribution. In each case, we follow the scheme of Bercu et al. Next, westate SLD for the Moran statistic $T_n=\frac{1}{n}\sum_{k=1}^n\log\frac{X_i}{\bar X_n}+\gamma \, ,$o\`u $\gamma$ , where γ is the Euler constant.Finally the appendix is devoted to some technical results
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Johansson, Emilia. „Factors controlling the sorption of Cs, Ni and U in soil : A statistical analysis with experimental sorption data of caesium, nickel and uranium in soils from the Laxemar area“. Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281938.
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In the fall of 2006, soils from three small valleys in the Laxemar/Oskarshamn area were sampled. A total of eight composite samples were characterized for a number of soil parameters that are important for geochemical sorption and were later also used in batch sorption experiments. Solid/liquid partition coefficients (Kd values) were then determined for seven radionuclides in each of the eight samples. To contribute to the interpretation of the sorption results together with the soil characterizations, this study aims to describe the sorption behavior of the radionuclides caesium, nickel and uranium and also discern which parameters that could provide a basis for estimating the strength of sorption of radionuclides in general. The methodology included quantitative methodologies such as compilation of chemical equilibrium diagrams by the software Hydra/Medusa and correlation analyses using the statistical software SPSS statistics. Based on the speciation diagrams of each radionuclide and identified important linear and non-linear relationships of the Kd values with a number of soil parameters, the following soil- and soil solution properties were found to have controlled the sorption of Cs, Ni and U, respectively, in the Laxemar soils. Cs: the specific surface area of the soil coupled to the clay content. Ni: the cation exchange capacity, alkaline solution pH, soil organic matter and dissolved organic matter. U: the cation exchange capacity, soil organic matter, dissolved organic matter, dissolved carbonate and alkaline solution pH. The soil that showed the strongest sorption varied between the nuclides, which can be related to the individual sorption behavior of caesium, nickel and uranium, as well as the different physicochemical properties of the soils. The parameters that should be prioritized in characterizations of soil samples are identified to be: solution pH, the cation exchange capacity, the specific surface area of the soil, soil organic matter and soil texture (clay content).För att kunna fatta beslut relaterade till hypotetisk framtida kontaminering från slutförvar av radioaktivt avfall är det direkt avgörande att förstå mobiliteten av radioaktiva element i miljön. Sorption är en av de viktigaste kemiska mekanismerna som kan minska spridningen av radionuklider i vatten/jord/bergssystem, där nukliderna fördelar sig mellan vätskefasen och ytor på fasta partiklar i dessa system. Fördelningskoefficienter (Kd värden) används generellt som ett kvantitativt mått på sorptionen, där ett högt Kd värde innebär att en större andel av ämnet i fråga är bundet till den fasta fasen. Under hösten 2006 togs jordprover från tre dalgångar i Laxemar/Oskarshamn. Totalt åtta jordprover karakteriserades för ett antal jordparametrar som är viktiga för geokemisk sorption och användes senare i batchförsök tillsammans med ett naturligt grundvatten. Fördelningskoefficienter (Kd värden) bestämdes för sju radionuklider (Cs, Eu, I, Ni, Np, Sr and U) för vart och ett av de åtta jordproverna. För att bidra till tolkningen av sorptionsresultaten tillsammans med jordprovernas egenskaper syftar denna studie till att beskriva sorptionsbeteendet hos radionukliderna caesium, nickel och uran samt urskilja vilka parametrar som kan fungera som grund för att uppskatta sorptionsstyrkan av radionuklider i allmänhet. För att uppnå detta syfte så har studien följande mål. Identifiera de jord- och marklösningsegenskaper som kontrollerar sorptionen av Cs, Ni respektive U i de åtta Laxemar proverna. Bestämma vilket Laxemar-jordprov som starkast sorberar de tre radionukliderna. Identifiera de jordparametrar som bör prioriteras vid jordkarakteriseringar, baserat på deras sorptionsinflytande, för att kunna uppskatta Kd värden endast med begränsad information om ett jordsystem. Metoden innefattade kvantitativa metoder såsom sammanställning av kemiska jämviktsdiagram med programvaran Hydra/Medusa och korrelationsanalyser med hjälp av statistikprogramvaran SPSS statistics. De kemiska jämviktsdiagrammen bidrog till att beskriva specieringen av respektive nuklid som en funktion av pH och korrelationsanalyserna bidrog till att identifiera linjära samband mellan par av variabler, tex mellan Kd och jordparametrar. Baserat på specieringsdiagrammen för varje radionuklid och identifierade viktiga linjära och icke-linjära förhållanden mellan Kd-värdena och ett antal jordparametrar har följande egenskaper hos jordarna och marklösningen visat sig huvudsakligen kontrollera sorptionen av Cs, Ni respektive U i de åtta Laxemar jordarna: För caesium gäller jordens specifika ytarea kopplad till lerinnehållet, medan för nickel är det katjonbytarkapaciteten, organiskt material, alkaliska pH-värden samt löst organiskt material. Sorptionen av uran befanns kontrolleras av katjonbytarkapaciteten, organiskt material, löst organiskt material, alkaliska pH-värden samt lösta karbonater. Den jord som visade starkast sorption varierar mellan de tre nukliderna, vilket kan relateras till nuklidernas individuella sorptionsbeteende i jord samt jordarnas olika fysikaliska och kemiska egenskaper. Parametrarna som bör prioriteras vid karaktärisering av jordprov identifierades vara: pH, katjonbytarkapaciteten, jordens specifika ytarea, mängden organiskt material samt jordtexturen (lerinnehåll).
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Lima, Leonardo da Silva e. „Centralidades em redes espaciais urbanas e localização de atividades econômicas“. reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/122524.
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Nos últimos anos, o estudo de propriedades de redes espaciais urbanas conhecidas como centralidades, tem sido utilizado com frequência para descrever fenômenos de ordem sócio-econômica associados à forma da cidade. Autores têm sugerido que centralidades são capazes de descrever a estrutura espacial urbana (KRAFTA, 1994; ANAS et al., 1998) e, portanto através do estudo de centralidades, é possível reconhecer os espaços que mais concentram fluxos, os que possuem os maiores valores de renda da terra, os mais seguros, entre outros aspectos que parecem estar diretamente relacionados com o fenômeno urbano. A hipótese dessa pesquisa admite que centralidades em redes espaciais urbanas desempenham um papel fundamental na formação da estrutura espacial urbana e na maneira como são organizados os usos do solo da cidade. Assim, essa pesquisa investiga qual modelo de centralidade, processado sobre diversas formas de se descrever o espaço urbano na forma de uma rede, é capaz de apresentar resultados mais fortemente correlacionados com a distribuição espacial de atividades econômicas urbanas. Nessa pesquisa são avaliados cinco modelos de centralidade, aplicados sobre diferentes redes espaciais urbanas com a intenção de se verificar qual deles apresenta maior correlação com a ocorrência de atividades econômicas. Para realizar tal exercício, esses modelos são aplicados sobre três tipos de redes espaciais urbanas (axial, nodal e trechos de rua) – oriundas da configuração espacial de três cidades brasileiras – processados de forma geométrica e topológica. Os modelos de centralidade aplicados são conhecidos como centralidade por Alcance (SEVTSUK; 2010), centralidade por Excentricidade (PORTA et al.; 2009, 2011), centralidade por Intermediação (FREEMAN, 1977), centralidade por Intermediação Planar (KRAFTA, 1994) e centralidade por Proximidade (INGRAM, 1971). O coeficiente de correlação Pearson (r) é utilizado como ferramenta capaz de descrever qual modelo de centralidade, associado a qual tipo de representação espacial e qual modo de processamento de distâncias melhor se correlaciona com a distribuição de atividades econômicas urbanas nessas cidades. As evidências encontradas nessa pesquisa sugerem que os modelos de centralidade por Alcance, centralidade por Excentricidade e centralidade por Intermediação Planar destacam-se em comparação com os demais modelos processados. Além disso, os valores de correlação Pearson (r) mais relevantes foram obtidos quando os modelos de centralidade foram processados considerando-se a geometria da rede formada por trechos de rua, indicando que um tipo de representação espacial mais desagregada e processada de forma geométrica seria mais capaz de apresentar os melhores valores de correlação para a compreensão do fenômeno urbano estudado.In recent years, the study of urban spatial networks has been often used to describe urban phenomena associated with the shape of the city. Researches suggested that centralities are able to describe the urban spatial structure (KRAFTA, 1994; ANAS et al., 1998) and then it is possible to recognize the spaces with more flows, which have the highest values of land revenue, the safest, among other aspects related to urban phenomenon. The hypothesis of this research accepts that centrality in urban spatial networks play a key role for the urban spatial structure and the way of land uses is organized. Thus, there would be some measures of centrality in urban spatial networks that would be more associated with economic activities occurring in the city. The research will evaluate five measures of centrality applied on three types of urban spatial networks (axial map, node map and segment map). Therefore we will use five models of centrality in urban spatial networks known as reach (SEVTSUK, MEKONNEN, 2012), straightness (PORTA et al., 2006b), betweenness (FREEMAN, 1977), planar betweenness (KRAFTA, 1994) and closeness (INGRAM, 1971) in order to determine which this most highly correlated with the occurrence of economic activities. The relationships between these measures of centrality and locations of economic activities are examined in three Brazilian cities, using as methodology the Pearson correlation coefficient (r). The highest correlation between the results of centrality in urban spatial networks and the location of economic activities will suggest which centrality measure, way of to describe urban space like a network and distance processing method (euclidian or topologic) is more associated with the occurrence of these activities in the city. The results indicate that Reach, Straightness and Planar Betweenness are most outstanding models of centrality. In addition, Pearson correlation coefficients (r) most relevant were obtained when models of centrality are processed considering euclidian paths in the street segments network, suggesting that this type of spatial network and distances processing method generates centralities with more significant correlation values within the urban phenomenon studied.
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Fernandes, Catarina Marques. „Liderança de empoderamento e trabalho digno“. Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/24511.
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O conceito de trabalho digno foi legitimado pela Organização Internacional do Trabalho em 1999, procurando dar resposta a questões no âmbito das políticas internacionais relacionadas com o trabalho. Devido às recentes mudanças no contexto organizacional, a liderança de empoderamento tem adquirido destaque na investigação e na prática. O objetivo do presente estudo é analisar a relação entre o trabalho digno e a liderança de empoderamento e de que forma as dimensões dos dois conceitos se associam. Os dados foram recolhidos através de dois questionários, o Decent Work Questionnaire e o Empowering Leadership Questionnaire, aplicados a 901 trabalhadores portugueses. Os dados foram analisados através do coeficiente de correlação de Pearson, cujos resultados indicaram que as correlações no geral são elevadas e que a dimensão Princípios e valores fundamentais no trabalho do trabalho digno e as dimensões Participação na tomada de decisão, Coaching e Demonstração de preocupação/interação com a equipa pertencentes à liderança de empoderamento são as que apresentam as correlações mais elevadas. Estes resultados demonstram a associação entre trabalho digno e a liderança de empoderamento, sugerindo que são conceitos com forte relação, embora distintos entre si;Empowering Leardership and Decent Work
Abstract:
The concept of decent work was legitimized by the International Labor Organization in 1999, seeking to address issues in international labor-related policies. Due to recent changes in the organizational context, empowering leadership has gained prominence in research and practice. The aim of the present study is to analyze the relationship between decent work and empowering leadership and how the dimensions of the two concepts are associated. Data were collected through two questionnaires, the Decent Work Questionnaire and the Empowering Leadership Questionnaire, applied to 901 Portuguese workers. The data were analyzed using Pearson's correlation coefficient, whose results indicated that the correlations are generally high and that the dimension Principles and fundamental values in decent work work and the dimensions Participation in decision making, Coaching and Demonstration of concern / interaction with the team belonging to the empowering leadership are those with the highest correlations. These results demonstrate the association between decent work and empowering leadership, suggesting that these concepts are strongly related, although different from each other.
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Kasianenko, Stanislav. „Predicting Software Defectiveness by Mining Software Repositories“. Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-78729.
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One of the important aims of the continuous software development process is to localize and remove all existing program bugs as fast as possible. Such goal is highly related to software engineering and defectiveness estimation. Many big companies started to store source code in software repositories as the later grew in popularity. These repositories usually include static source code as well as detailed data for defects in software units. This allows analyzing all the data without interrupting programing process. The main problem of large, complex software is impossibility to control everything manually while the price of the error can be very high. This might result in developers missing defects on testing stage and increase of maintenance cost. The general research goal is to find a way of predicting future software defectiveness with high precision. Reducing maintenance and development costs will contribute to reduce the time-to-market and increase software quality. To address the problem of estimating residual defects an approach was found to predict residual defectiveness of a software by the means of machine learning. For a prime machine learning algorithm, a regression decision tree was chosen as a simple and reliable solution. Data for this tree is extracted from static source code repository and divided into two parts: software metrics and defect data. Software metrics are formed from static code and defect data is extracted from reported issues in the repository. In addition to already reported bugs, they are augmented with unreported bugs found on “discussions” section in repository and parsed by a natural language processor. Metrics were filtered to remove ones, that were not related to defect data by applying correlation algorithm. Remaining metrics were weighted to use the most correlated combination as a training set for the decision tree. As a result, built decision tree model allows to forecast defectiveness with 89% chance for the particular product. This experiment was conducted using GitHub repository on a Java project and predicted number of possible bugs in a single file (Java class). The experiment resulted in designed method for predicting possible defectiveness from a static code of a single big (more than 1000 files) software version.
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Le, Trang Thi, Doan Dang Phan, Bao Dang Khoa Huynh, Van Tho Le und Van Tu Nguyen. „Phytoplankton diversity and its relation to the physicochemical parameters in main water bodies of Vinh Long province, Vietnam“. Technische Universität Dresden, 2019. https://tud.qucosa.de/id/qucosa%3A70829.
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Phytoplankton samples were collected in 2016 during the dry and rainy seasons at nine sampling sites in Vinh Long province, Vietnam. Some basic environment parameters such as temperature, pH, dissolved oxygen, nitrate and phosphate were measured and a total of 209 phytoplankton species (six phyla, 96 genera) were identified. The phylum that had the greatest number of species was Bacillariophyta (82 species), followed by Chlorophyta (61 species), Cyanophyta (39 species), Euglenophyta (21 species), Chrysophyta (three species) and Dinophyta (three3 species). The phytoplankton density ranged from 4,128 to 123,029 cells/liter. The dominant algae recorded in the study area include Microcystis aeruginosa, Merismopedia glauca, Oscillatoria perornata, Jaaginema sp., Planktothrix agardhii, Coscinodiscus subtilis, Melosira granulata. In particular, Microcystis aeruginosa was the most density dominant species in the total number of sampling sites during the dry season survey, and this species was classified as a group producing toxins harmful to the environment. Surface water quality, according to QCVN 08: 2015/BTNMT was classified into Column A1 for pH, nitrate and Column B1 for dissolved oxygen, and Column B2 for phosphate. Phytoplankton community structure and environmental factors changed substantially between dry and rainy seasons. A Pearson (r) correlation coefficient was used for the relative analysis. The results indicated that the number of phytoplankton species were a significantly positive correlation with pH, dissolved oxygen and nitrate in the rainy season. The phytoplankton abundance was uncorrelated with environmental factors in both seasons.Các mẫu thực vật phù du được thu thập trong năm 2016 (mùa khô và mùa mưa) tại 9 vị trí ở tỉnh Vĩnh Long, Việt Nam. Một số thông số môi trường như nhiệt độ, pH, oxy hòa tan, nitrat và phốt phát được đo ngay tại hiện trường. Tổng cộng 209 loài thực vật phù du được ghi nhận (6 ngành, 96 chi). Số lượng loài cao nhất là tảo Silic (82 loài), kế đến là tảo Lục (61 loài), tảo Lam (39 loài), tảo Mắt (21 loài), tảo Vàng ánh (3 loài) và tảo Giáp (3 loài). Mật độ thực vật phù du dao động từ 4.128 đến 123.029 tế bào/ lít. Các loài ưu thế ghi nhận được ở khu vực nghiên cứu gồm có: Microcystis aeruginosa, Merismopedia glauca, Oscillatoria perornata, Jaaginema sp., Planktothrix agardhii; Coscinodiscus subtilis, Melosira granulata. Trong đó, loài Microcystis aeruginosa chiếm ưu thế nhiều nhất trên tổng số điểm thu mẫu trong đợt khảo sát mùa khô, đồng thời loài này được xếp vào nhóm sản sinh độc tố gây hại cho môi trường. Chất lượng nước mặt theo QCVN 08:2015/BTNMT được xếp vào loại A1 đối với thông số pH, nitrat và loại B1 đối với thông số oxy hòa tan, và loại B2 đối với phốt phát. Cấu trúc quần xã thực vât nổi và các yếu tố môi trường thay đổi đáng kể giữa mùa mưa và mừa khô. Hệ số tương quan Pearson (r) được dùng để phân tích. Kết quả cho thấy số lượng thực vật phù du có tương quan thuận với pH, oxy hòa tan và nitrat trong mùa mưa và có ý nghĩa về mặt thống kê. Mật độ của thực vật phù du không tương quan với các yếu tố môi trường trong cả hai mùa.
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Siqueira, Lucas Alfredo. „Titulador automático baseado em filmes digitais para determinação de dureza e alcalinidade total em águas minerais/Titulador automático baseado em filmes digitais para determinação de dureza e alcalinidade total em águas minerais“. Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/9013.
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Total hardness and Total alkalinity are important physico-chemical parameters for the evaluation of water quality and are determined by volumetric analytical methods. These methods have difficult to detect the endpoint of the titration due to the difficult of viewing the color transition inherent to each of them. To circumvent this problem, here is proposed a new automatic method for the detection of the titration end point for the determination of total hardness and total alkalinity in mineral water samples. The proposed flow-batch titrator consists of a peristaltic pump, five three-way solenoid valves, a magnetic stirrer, an electronic actuator, an Arduino MEGA 2560TM board, a mixing chamber and a webcam. The webcam records the digital movie (DM) during the addition of the titrant towards mixing chamber, also recording the color variations resulting from chemical reactions between titrant and sample within chamber. While the DM is recorded, it is decompiled into frames ordered sequentially at a constant rate of 30 frames per second (FPS). The first frame is used as a reference to define the region of interest (RI) of 48 × 50 pixels and the R channel values, which are used to calculate the Pearson's correlation coefficient (r) values. r is calculated between the R values of the initial frame and each subsequent frame. The titration curves are plotted in real time using the values of r (ordinate axis) and the total opening time of the valve titrant (abscissa axis). The end point is estimated by the second derivative method. A software written in ActionScript 3.0 language manages all analytical steps and data treatment in real time. The feasibility of the method was attested by its application for the analysis of natural water samples. Results were compared with classical titration and did not present statistically significant differences when the paired ttest at the 95% confidence level was applied. The proposed method is able to process about 71 samples per hour, and its precision was confirmed by overall relative standard deviation (RSD) values, always lower than the 2,4% for total hardness and 1,4% for total alkalinity.
A dureza total e a alcalinidade total são importantes parâmetros físico-químicos para avaliação da qualidade de águas e são determinados por métodos volumétricos de análise. Estes métodos apresentam difícil detecção do ponto final da titulação devido à dificuldade de visualização das transições de cores inerentes a cada um deles. Para contornar este problema, foi proposta neste trabalho uma nova metodologia automática para a detecção do ponto final nas determinações de dureza total e alcalinidade total em águas. O titulador em fluxo-batelada proposto é composto de uma bomba peristáltica, cinco válvulas solenoides de três vias, um agitador magnético, um acionador de válvulas, uma placa Arduíno MEGA 2560TM, uma câmara de mistura e uma webcam. O programa de gerenciamento e controle do titulador foi escrito em linguagem ActionScript 3.0. A webcam grava o filme digital durante a adição do titulante na câmara de mistura, registrando as variações de cor decorrentes das reações químicas entre titulante e amostra no interior de câmara. Enquanto o filme é gravado, este é decomposto em quadros ordenados sequencialmente a uma taxa constante de 30 quadros por segundo (FPS). O primeiro quadro é utilizado como referência para definir uma região de interesse (RI) com 48 x 50 pixels, na qual seus valores R, G e B são utilizados para calcular os valores de coeficiente de correlação de Pearson (r). O valor de r é calculado entre os valores de R do quadro inicial e de cada quadro subsequente. As curvas de titulação são obtidas em tempo real usando os valores de r (ordenadas) e o tempo total de abertura da válvula de titulante (abscissas). O ponto final é estimado pelo método de segunda derivada. O método foi aplicado na análise de águas minerais e os resultados foram comparados com a titulação clássica, não apresentando diferenças estatisticamente significativas com aplicação do teste t pareado a 95% de confiança. O método proposto foi capaz de processar até 71 amostras por hora e a sua precisão foi confirmada pelos valores de desvio padrão relativos (DPR) globais, sempre inferiores as 2,4% para dureza total e 1,4% para alcalinidade total.
Bücher zum Thema "Pearson Correlation Coefficient 13"
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Streiner, David L., Geoffrey R. Norman und John Cairney. Reliability. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199685219.003.0008.
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This chapter reviews the basic theory of reliability, and examines the relation between reliability and measurement error. It derives the standard form of reliability, the intraclass correlation or ICC, from repeated measures ANOVA. The chapter explores issues in the application of the reliability coefficient, including absolute versus relative reliability, the reliability of multiple observations, and the standard error of measurement. It examines several other measures of reliability—Cohen’s kappa, Pearson r, and the method of Altman and Bland—and derives the relation between them and the ICC. The chapter determines the variance of a reliability estimate. It also calculates sample size estimates for reliability studies, and methods to combine reliability estimates in systematic reviews.
Buchteile zum Thema "Pearson Correlation Coefficient 13"
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Gooch, Jan W. „Pearson Correlation Coefficient“. In Encyclopedic Dictionary of Polymers, 990. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_15317.
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Nahler, Gerhard. „Pearson correlation coefficient“. In Dictionary of Pharmaceutical Medicine, 132. Vienna: Springer Vienna, 2009. http://dx.doi.org/10.1007/978-3-211-89836-9_1025.
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Benesty, Jacob, Jingdong Chen, Yiteng Huang und Israel Cohen. „Pearson Correlation Coefficient“. In Noise Reduction in Speech Processing, 1–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00296-0_5.
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Wang, Jiguang. „Pearson Correlation Coefficient“. In Encyclopedia of Systems Biology, 1671. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-9863-7_372.
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Patten, Mildred L., und Michelle Newhart. „The Pearson Correlation Coefficient (r)“. In Understanding Research Methods, 231–35. Tenth edition. | New York, NY : Routledge, 2017.: Routledge, 2017. http://dx.doi.org/10.4324/9781315213033-75.
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Yockey, Ronald D. „The Pearson r Correlation Coefficient“. In SPSS® Demystified, 156–63. Third edition. | New York, NY : Routledge, 2017.: Routledge, 2018. http://dx.doi.org/10.4324/9781315268545-14.
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Yockey, Ronald D. „The Pearson r Correlation Coefficient“. In SPSS Demystified, 158–65. 4. Aufl. New York: Routledge, 2023. http://dx.doi.org/10.4324/9781003028154-14.
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Brysbaert, Marc. „Improving predictions through the Pearson correlation coefficient“. In Basic Statistics for Psychologists, 261–97. London: Macmillan Education UK, 2011. http://dx.doi.org/10.1007/978-0-230-34592-8_11.
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Muravsky, Leonid, Yuriy Kotsiuba und Yaroslav Kulynych. „Assessment of Unknown Phase Shift for Speckle Interferometry Using Sample Pearson Correlation Coefficient“. In Advances in Intelligent Systems and Computing, 671–81. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-63270-0_46.
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Saidi, Rania, Waad Bouaguel und Nadia Essoussi. „Hybrid Feature Selection Method Based on the Genetic Algorithm and Pearson Correlation Coefficient“. In Machine Learning Paradigms: Theory and Application, 3–24. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02357-7_1.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "Pearson Correlation Coefficient 13"
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Wang, Kenan, Hui Xu, Yanhua Peng und Shixiang Zhou. „A novel harmonic emission source locating algorithm based on Pearson correlation coefficient“. In 2024 International Applied Computational Electromagnetics Society Symposium (ACES-China), 1–3. IEEE, 2024. http://dx.doi.org/10.1109/aces-china62474.2024.10699836.
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He, Kanghang, Tao Zhang, Yanming Cao, Juzhen Wu und Baoli Liu. „Intelligent Analysis and Software Development of Converter Transformer Failure Cases Based on Pearson Correlation Coefficient“. In 2024 3rd Asian Conference on Frontiers of Power and Energy (ACFPE), 245–49. IEEE, 2024. https://doi.org/10.1109/acfpe63443.2024.10800759.
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Wu, Lijuan. „Automatic Scoring Model for English Compositions Using Bidirectional Encoder Representations from Transformer with Pearson Correlation Coefficient“. In 2024 International Conference on Integrated Intelligence and Communication Systems (ICIICS), 1–5. IEEE, 2024. https://doi.org/10.1109/iciics63763.2024.10859946.
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Huang, Liting, und Huizhi Liang. „Zhenmei at WASSA-2024 Empathy and Personality Shared Track 2 Incorporating Pearson Correlation Coefficient as a Regularization Term for Enhanced Empathy and Emotion Prediction in Conversational Turns“. In Proceedings of the 14th Workshop on Computational Approaches to Subjectivity, Sentiment, & Social Media Analysis, 399–403. Stroudsburg, PA, USA: Association for Computational Linguistics, 2024. http://dx.doi.org/10.18653/v1/2024.wassa-1.34.
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Rus, Madalina, Silvia Veresiu, Elena Mereuta, Valentin Amortila und George Balasoiu. „EVALUATING THE IMPACT OF AUTOMOBILE POLLUTION ON THE HEALTH OF THE ROMANIAN POPULATION THROUGH STATISTICAL METHODS“. In 24th SGEM International Multidisciplinary Scientific GeoConference 24, 395–402. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/4.1/s19.52.
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This research aims to conduct a descriptive statistical analysis to identify the statistical correlation between categories of new and second-hand vehicles registered for circulation in Romania and various health conditions associated with atmospheric pollution. Currently, a significant challenge for the global community lies in mitigating the impact of atmospheric pollution, considered a crucial factor both in terms of global climate change and its impact on public health. One major source of atmospheric pollution stems from emissions generated by internal combustion engines in the transportation sector. According to studies conducted by the European Environment Agency, approximately 70% of total greenhouse gas emissions originate from road transport, surpassing the European average in Romania due to the substantial number of second-hand vehicles registered and in circulation. Emissions resulting from petroleum-based fuels are associated with the onset of cardiovascular and respiratory system conditions. Through this descriptive statistical analysis, grounded in the Pearson correlation coefficient, we aim to emphasize the existing relationship between the number of vehicles and the prevalence of respiratory and cardiovascular system conditions, etc., with the goal of drawing attention to the implications of auto pollution. To conduct this study, we utilized data available on the National Institute of Statistics (INSSE) portal, covering a 21-year interval from January 2000 to December 2021.
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Muka, Enkeleda, Vera Antonova und Hristo Andonov. „THE CORRELATIONS BETWEEN ANTHROPOMETRIC PARAMETERS AND MOTOR SKILLS AMONG FEMALE VOLLEYBALL PLAYERS AT AGE 11–13 YEARS OLD IN ALBANIA“. In INTERNATIONAL SCIENTIFIC CONGRESS “APPLIED SPORTS SCIENCES”. Scientific Publishing House NSA Press, 2022. http://dx.doi.org/10.37393/icass2022/43.
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ABSTRACT This study aims to identify a correlation between anthropometric characteristics and motor skills in female volleyball players aged 11–13. Methodology: The study examined the anthropometric characteristics and indicators of a special performance in volleyball of 20 volleyball players from Albania. Height, weight, BMI, and standing reach with one and both arms (blockade), indicators that are important for volleyball athletes, were measured when determining the anthropometric indicators. The special performance of volleyball players was determined by a test battery that included eight tests. The Pearson correlation coefficient (p-value) was used in the data calculation to find the relationship between the variables. Conclusions: The results obtained from statistical data processing through the Anova platform show no correlations between anthropometric parameters and the T-test. Otherwise, they show a significant relationship between speed endurance and height (r = -.47, p = .03) and between speed endurance and the standing reach test (r = -.48, p = .02). The results indicate that there are no significant correlations between height with blocking jump and running vertical jump (p more than .05), among standing reach with blocking jump and running vertical jump (p more than .05), and also among blockade with blocking jump and running vertical jump (p more than .05). It is noted that there is a significant relationship between BMI and vertical jump (r = -.5, p = .01) and also between some anthropometric parameters and medicine ball throwing (p less than .05).
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Liu, Jing, Yong Zhang und Qinjun Zhao. „Video stabilization algorithm based on Pearson correlation coefficient“. In 2019 International Conference on Advanced Mechatronic Systems (ICAMechS). IEEE, 2019. http://dx.doi.org/10.1109/icamechs.2019.8861649.
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Liu, Jing, Yong Zhang und Qinjun Zhao. „Adaptive ViBe Algorithm Based on Pearson Correlation Coefficient“. In 2019 Chinese Automation Congress (CAC). IEEE, 2019. http://dx.doi.org/10.1109/cac48633.2019.8997209.
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Mujahid, Adnan K. R., und Chandrasegar Thirumalai. „Pearson Correlation Coefficient Analysis (PCCA) on Adenoma carcinoma cancer“. In 2017 International Conference on Trends in Electronics and Informatics (ICOEI). IEEE, 2017. http://dx.doi.org/10.1109/icoei.2017.8300976.
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„Fuzzy-weighted Pearson Correlation Coefficient for Collaborative Recommender Systems“. In 15th International Conference on Enterprise Information Systems. SciTePress - Science and and Technology Publications, 2013. http://dx.doi.org/10.5220/0004412404090414.
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Duvvuri, Sarvani, und Srinivas S. Pulugurtha. Researching Relationships between Truck Travel Time Performance Measures and On-Network and Off-Network Characteristics. Mineta Transportation Institute, Juli 2021. http://dx.doi.org/10.31979/mti.2021.1946.
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Trucks serve significant amount of freight tonnage and are more susceptible to complex interactions with other vehicles in a traffic stream. While traffic congestion continues to be a significant ‘highway’ problem, delays in truck travel result in loss of revenue to the trucking companies. There is a significant research on the traffic congestion mitigation, but a very few studies focused on data exclusive to trucks. This research is aimed at a regional-level analysis of truck travel time data to identify roads for improving mobility and reducing congestion for truck traffic. The objectives of the research are to compute and evaluate the truck travel time performance measures (by time of the day and day of the week) and use selected truck travel time performance measures to examine their correlation with on-network and off-network characteristics. Truck travel time data for the year 2019 were obtained and processed at the link level for Mecklenburg County, Wake County, and Buncombe County, NC. Various truck travel time performance measures were computed by time of the day and day of the week. Pearson correlation coefficient analysis was performed to select the average travel time (ATT), planning time index (PTI), travel time index (TTI), and buffer time index (BTI) for further analysis. On-network characteristics such as the speed limit, reference speed, annual average daily traffic (AADT), and the number of through lanes were extracted for each link. Similarly, off-network characteristics such as land use and demographic data in the near vicinity of each selected link were captured using 0.25 miles and 0.50 miles as buffer widths. The relationships between the selected truck travel time performance measures and on-network and off-network characteristics were then analyzed using Pearson correlation coefficient analysis. The results indicate that urban areas, high-volume roads, and principal arterial roads are positively correlated with the truck travel time performance measures. Further, the presence of agricultural, light commercial, heavy commercial, light industrial, single-family residential, multi-family residential, office, transportation, and medical land uses increase the truck travel time performance measures (decrease the operational performance). The methodological approach and findings can be used in identifying potential areas to serve as truck priority zones and for planning decentralized delivery locations.