Добірка наукової літератури з теми "Survival test"

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Статті в журналах з теми "Survival test"

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GANS, CARL. "Survival test." Nature 349, no. 6305 (January 1991): 112. http://dx.doi.org/10.1038/349112b0.

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Fox, Jeffrey L. "Thrombolytic survival test." Nature Biotechnology 11, no. 2 (February 1993): 153. http://dx.doi.org/10.1038/nbt0293-153.

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Ziegler, A., S. Lange, and R. Bender. "Survival analysis: Log rank test." DMW - Deutsche Medizinische Wochenschrift 129 (November 2004): T4—T6. http://dx.doi.org/10.1055/s-2004-836075.

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Opdahl, Helge. "Survival put to the acid test." Critical Care Medicine 25, no. 8 (August 1997): 1431–36. http://dx.doi.org/10.1097/00003246-199708000-00035.

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Fenner, Annette. "6-monthly PSA test predicts survival." Nature Reviews Urology 13, no. 9 (August 2, 2016): 495. http://dx.doi.org/10.1038/nrurol.2016.145.

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Park, Sang-Gue, Choon-Mo Ahn, Byung-Chun Kim, and Yong-Goo Lee. "Logrank test for bivariate survival data." Communications in Statistics - Simulation and Computation 29, no. 2 (January 2000): 533–40. http://dx.doi.org/10.1080/03610910008813626.

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Baumgartner, János, Zoltán Süle, Botond Bertók, and János Abonyi. "Test-sequence optimisation by survival analysis." Central European Journal of Operations Research 27, no. 2 (August 21, 2018): 357–75. http://dx.doi.org/10.1007/s10100-018-0578-z.

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Mills, Laura. "Wilderness Survival Guide to the T Test." Journal of Therapeutic Schools and Programs 1, no. 9 (2017): 54–57. http://dx.doi.org/10.19157/jtsp.issue.09.01.07.

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Hart, Stephen. "Test-Tube Survival of the Molecularly Fit." BioScience 43, no. 11 (December 1993): 738–41. http://dx.doi.org/10.2307/1312317.

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Commenges, D., and P. K. Andersen. "Score test of homogeneity for survival data." Lifetime Data Analysis 1, no. 2 (1995): 145–56. http://dx.doi.org/10.1007/bf00985764.

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Дисертації з теми "Survival test"

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Eklund, Karin, and Malin Engström. "Comparison between two different cryoprotectants for human sperm, with emphasis on survival." Thesis, Uppsala University, Department of Medical Biochemistry and Microbiology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9287.

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The increasing number of patients undergoing treatment with assisted reproductive techniques (ART) during the past years have led to the need of developing different methods for separation of spermatozoa that can be used for different fertilisation procedures and for freezing. Cryopreservation of spermatozoa includes preparation, freezing, storage and thawing.

In this study two different cryomedia (Cryo Protec I and Cryo Protec II) for human spermatozoa were compared. The main outcome was spermsurvival rate for spermatozoa after freezing. Sperm viability was assessed using the Hypo-osmotic swelling test which is based on osmolality.

A total of 86 samples of semen were used in this study (Cryo Protec I=38, Cryo Protec II=48). The survival rate between the two cryomedia did not differ much but Cryo Protectant I showed a small increase in survival for the spermatozoa after freezing. The Hypo-osmotic swelling test also showed similar values of viable spermatozoa for the two cryomedia both before and after freezing.

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Tahir, Muhammad-Ramzan. "On validation of parametric models applied in survival analysis and reliability." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14547/document.

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Le premier objectif de la thèse est de présenter un test d'ajustement pour les modèles paramétriques couramment utilisés en l'analyse de survie, la fiabilité, les sciences sociales, l'ingénierie, la santé publique et la démographie, en présence de censure à droite. Nous développons un logiciel en langue R pour les modèles paramétrique. Le modèle de Birnbaum-Saunders (BS) est utilisé pour la test d'ajustement pour les modèles AFT paramétriques et en analyse de système redondant. L'autre contribution porte sur l'analyse de système redondant composé avec une composante en état hot et l'autre en réserve fonctionnent en état warm pour augmenter la fiabilité de systeme. Nous calculons la fiabilité du système en termes de Fonction de répartition et nous donnons l'intervalle de confiance asymptotique
This is an increasing importance in survival analysis and reliability to select a suitable basic model for further inquiries of the data. Little deviation in basic model can cause serious problems in final results. The presence of censoring and accelerated stresses make this task more difficult. Chi-square type goodness of fit tests are most commonly used for model selection. Many modifications in chi-square tests have been proposed by various researcher. The first aim of the thesis is to present a goodness of fit test for wide rage of parametric models (shape-scale families) commonly used in survival analysis, social sciences, engineering, public health and demography, in presence of right censoring. We give the explicit forms of the quadratic form of the test statistic (NRR test) for various models and apply the test on real data. We develop a computer program in R-language for all models. A separate section is dedicated for the test in demography. We focus on the Birnbaum-Saunders (BS) distribution for goodness of fit test for parametric AFT-model and analysis of redundant system.The other purpose of the thesis is to give the analysis of redundant system. To ensure high reliability of the main components of the systems, standby units are used. The main component is replaced by the standby unit automatically, if it fails. The standby unit can be in warm, hot, or cold state. We give the procedure of one main and (n-1) standby units placed in hot state, and give the detailed analysis of one main and one standby unit using BS parametric family. We use Sedyakin's physical principal and the approach of accelerated failure time model for the analysis of redundant system. This approach is different from the traditional ones in the literature but difficulties in calculations. We calculate the reliability of the system in terms of distribution function (unreliability function) and asymptotic confidence interval
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Jubane, Ido. "A simulation study of the behaviour of the logrank test under different levels of stratification and sample sizes." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1018558.

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In clinical trials, patients are enrolled into two treatment arms. A researcher may be interested in studying the effectiveness of a new drug or the comparison of two drugs for the treatment of a disease. This survival data is later analysed using the logrank test or the Cox regression model to detect differences in survivor functions. However, the power function of the logrank test depends solely on the number of patients enrolled into the study. Because statisticians will always minimise type I and type II errors, a researcher carrying out a clinical trial must define beforehand, the number of patients to be enrolled into the clinical study. Without proper sample size and power estimation a clinical trial may fail to detect a false hypothesis of the equality of survivor functions. This study presents through simulation, a way of power and sample size estimation for clinical trials that use the logrank test for their data analysis and suggests an easy method to estimate power and sample size in such clinical studies. Findings on power analysis and sample size estimation on logrank test are applied to two real examples: one is the Veterans' Administration Lung Cancer study; and the other is the data from a placebo controlled trial of gamma interferon in chronic granulotomous disease.
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Oller, Piqué Ramon. "Survival analysis issues with interval-censored data." Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/6520.

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L'anàlisi de la supervivència s'utilitza en diversos àmbits per tal d'analitzar dades que mesuren el temps transcorregut entre dos successos. També s'anomena anàlisi de la història dels esdeveniments, anàlisi de temps de vida, anàlisi de fiabilitat o anàlisi del temps fins a l'esdeveniment. Una de les dificultats que té aquesta àrea de l'estadística és la presència de dades censurades. El temps de vida d'un individu és censurat quan només és possible mesurar-lo de manera parcial o inexacta. Hi ha diverses circumstàncies que donen lloc a diversos tipus de censura. La censura en un interval fa referència a una situació on el succés d'interès no es pot observar directament i només tenim coneixement que ha tingut lloc en un interval de temps aleatori. Aquest tipus de censura ha generat molta recerca en els darrers anys i usualment té lloc en estudis on els individus són inspeccionats o observats de manera intermitent. En aquesta situació només tenim coneixement que el temps de vida de l'individu es troba entre dos temps d'inspecció consecutius.

Aquesta tesi doctoral es divideix en dues parts que tracten dues qüestions importants que fan referència a dades amb censura en un interval. La primera part la formen els capítols 2 i 3 els quals tracten sobre condicions formals que asseguren que la versemblança simplificada pot ser utilitzada en l'estimació de la distribució del temps de vida. La segona part la formen els capítols 4 i 5 que es dediquen a l'estudi de procediments estadístics pel problema de k mostres. El treball que reproduïm conté diversos materials que ja s'han publicat o ja s'han presentat per ser considerats com objecte de publicació.

En el capítol 1 introduïm la notació bàsica que s'utilitza en la tesi doctoral. També fem una descripció de l'enfocament no paramètric en l'estimació de la funció de distribució del temps de vida. Peto (1973) i Turnbull (1976) van ser els primers autors que van proposar un mètode d'estimació basat en la versió simplificada de la funció de versemblança. Altres autors han estudiat la unicitat de la solució obtinguda en aquest mètode (Gentleman i Geyer, 1994) o han millorat el mètode amb noves propostes (Wellner i Zhan, 1997).

El capítol 2 reprodueix l'article d'Oller et al. (2004). Demostrem l'equivalència entre les diferents caracteritzacions de censura no informativa que podem trobar a la bibliografia i definim una condició de suma constant anàloga a l'obtinguda en el context de censura per la dreta. També demostrem que si la condició de no informació o la condició de suma constant són certes, la versemblança simplificada es pot utilitzar per obtenir l'estimador de màxima versemblança no paramètric (NPMLE) de la funció de distribució del temps de vida. Finalment, caracteritzem la propietat de suma constant d'acord amb diversos tipus de censura. En el capítol 3 estudiem quina relació té la propietat de suma constant en la identificació de la distribució del temps de vida. Demostrem que la distribució del temps de vida no és identificable fora de la classe dels models de suma constant. També demostrem que la probabilitat del temps de vida en cadascun dels intervals observables és identificable dins la classe dels models de suma constant. Tots aquests conceptes els
il·lustrem amb diversos exemples.

El capítol 4 s'ha publicat parcialment en l'article de revisió metodològica de Gómez et al. (2004). Proporciona una visió general d'aquelles tècniques que s'han aplicat en el problema no paramètric de comparació de dues o més mostres amb dades censurades en un interval. També hem desenvolupat algunes rutines amb S-Plus que implementen la versió permutacional del tests de Wilcoxon, Logrank i de la t de Student per a dades censurades en un interval (Fay and Shih, 1998). Aquesta part de la tesi doctoral es complementa en el capítol 5 amb diverses propostes d'extensió del test de Jonckeere. Amb l'objectiu de provar una tendència en el problema de k mostres, Abel (1986) va realitzar una de les poques generalitzacions del test de Jonckheere per a dades censurades en un interval. Nosaltres proposem altres generalitzacions d'acord amb els resultats presentats en el capítol 4. Utilitzem enfocaments permutacionals i de Monte Carlo. Proporcionem programes informàtics per a cada proposta i realitzem un estudi de simulació per tal de comparar la potència de cada proposta sota diferents models paramètrics i supòsits de tendència. Com a motivació de la metodologia, en els dos capítols s'analitza un conjunt de dades d'un estudi sobre els beneficis de la zidovudina en pacients en els primers estadis de la infecció del virus VIH (Volberding et al., 1995).

Finalment, el capítol 6 resumeix els resultats i destaca aquells aspectes que s'han de completar en el futur.
Survival analysis is used in various fields for analyzing data involving the duration between two events. It is also known as event history analysis, lifetime data analysis, reliability analysis or time to event analysis. One of the difficulties which arise in this area is the presence of censored data. The lifetime of an individual is censored when it cannot be exactly measured but partial information is available. Different circumstances can produce different types of censoring. Interval censoring refers to the situation when the event of interest cannot be directly observed and it is only known to have occurred during a random interval of time. This kind of censoring has produced a lot of work in the last years and typically occurs for individuals in a study being inspected or observed intermittently, so that an individual's lifetime is known only to lie between two successive observation times.

This PhD thesis is divided into two parts which handle two important issues of interval censored data. The first part is composed by Chapter 2 and Chapter 3 and it is about formal conditions which allow estimation of the lifetime distribution to be based on a well known simplified likelihood. The second part is composed by Chapter 4 and Chapter 5 and it is devoted to the study of test procedures for the k-sample problem. The present work reproduces several material which has already been published or has been already submitted.

In Chapter 1 we give the basic notation used in this PhD thesis. We also describe the nonparametric approach to estimate the distribution function of the lifetime variable. Peto (1973) and Turnbull (1976) were the first authors to propose an estimation method which is based on a simplified version of the likelihood function. Other authors have studied the uniqueness of the solution given by this method (Gentleman and Geyer, 1994) or have improved it with new proposals (Wellner and Zhan, 1997).

Chapter 2 reproduces the paper of Oller et al. (2004). We prove the equivalence between different characterizations of noninformative censoring appeared in the literature and we define an analogous constant-sum condition to the one derived in the context of right censoring. We prove as well that when the noninformative condition or the constant-sum condition holds, the simplified likelihood can be used to obtain the nonparametric maximum likelihood estimator (NPMLE) of the failure time distribution function. Finally, we characterize the constant-sum property according to different types of censoring. In Chapter 3 we study the relevance of the constant-sum property in the identifiability of the lifetime distribution. We show that the lifetime distribution is not identifiable outside the class of constant-sum models. We also show that the lifetime probabilities assigned to the observable intervals are identifiable inside the class of constant-sum models. We illustrate all these notions with several examples.

Chapter 4 has partially been published in the survey paper of Gómez et al. (2004). It gives a general view of those procedures which have been applied in the nonparametric problem of the comparison of two or more interval-censored samples. We also develop some S-Plus routines which implement the permutational version of the Wilcoxon test, the Logrank test and the t-test for interval censored data (Fay and Shih, 1998). This part of the PhD thesis is completed in Chapter 5 by different proposals of extension of the Jonckeere's test. In order to test for an increasing trend in the k-sample problem, Abel (1986) gives one of the few generalizations of the Jonckheree's test for interval-censored data. We also suggest different Jonckheere-type tests according to the tests presented in Chapter 4. We use permutational and Monte Carlo approaches. We give computer programs for each proposal and perform a simulation study in order compare the power of each proposal under different parametric assumptions and different alternatives. We motivate both chapters with the analysis of a set of data from a study of the benefits of zidovudine in patients in the early stages of the HIV infection (Volberding et al., 1995).

Finally, Chapter 6 summarizes results and address those aspects which remain to be completed.
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Bagdonavičius, Vilijandas B., Ruta Levuliene, Mikhail S. Nikulin, and Olga Zdorova-Cheminade. "Tests for homogeneity of survival distributions against non-location alternatives and analysis of the gastric cancer data." Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2011/5152/.

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The two and k-sample tests of equality of the survival distributions against the alternatives including cross-effects of survival functions, proportional and monotone hazard ratios, are given for the right censored data. The asymptotic power against approaching alternatives is investigated. The tests are applied to the well known chemio and radio therapy data of the Gastrointestinal Tumor Study Group. The P-values for both proposed tests are much smaller then in the case of other known tests. Differently from the test of Stablein and Koutrouvelis the new tests can be applied not only for singly but also to randomly censored data.
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Liang, Yi. "Likelihood ratio test for the presence of cured individuals : a simulation study /." Internet access available to MUN users only, 2002. http://collections.mun.ca/u?/theses,157472.

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Lauth, John R. "Development of methodology for community level toxicity testing using the fathead minnow seven day survival-growth impairment test." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39417.

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Single species toxicity tests are widely used to assess the potential effects of a toxicant on aquatic life. Increasingly, it is necessary to understand how the results of these tests relate to toxicant effects in natural communities. This dissertation presents the methodology and validation for a community level toxicity test that bridges the gap between single species tests and natural community responses. The research involved control of environmental parameters, improvement of feeding regimes and testing of the final community. The results are presented as four separate papers. The first paper addresses the development and validation of a standardized reconstituted water for culturing and toxicity testing of algae, cladocerans, a rotifer and two fish species. The next two papers address the substitution of the food source currently used in the fathead minnow survival-growth impairment test (Artemia) with a freshwater food source (the rotiter, Brachionus calyciflorus). Along with the alga Chlorella vulgaris (producer), B. calyciflorus (primary consumer) and the fathead minnow larvae (secondary consumer) comprise a three level food chain that was used to address trophic level interactions (feeding reduction and growth impairment) in the final phase of this research. The end result is an experimental procedure in which environmental parameters (water quality, temperature, etc.) and trophic structure parameters (Le. producer and primary consumer density) can be controlled well enough to insure that any shifts in community structure can be attributed to toxicant related effects.
Ph. D.
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Mai, Yabing. "Comparing survival distributions in the presence of dependent censoring asymptotic validity and bias-corrections of the logrank test /." College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8037.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.
Thesis research directed by: Dept. of Mathematics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Morris, Jesse Randal. "Methods and Application for Tracking Seedling Fate on the Utah Test and Training Range." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/9102.

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Remote sensing of the environment has become an effective and useful research approach applied across a wide range of scientific and professional disciplines. Generally remote sensing is used to evaluate patterns and processes at broad spatio-temporal scales, such as classifying landscape vegetation patterns or for creating digital surface models, however, there are increasing opportunities to expand the use of remotely sensed information to a wider range of applications at variable spatial and temporal scales. In the field of plant seedling and germination research methods are needed to improve plant establishment and restoration monitoring, particularly in areas that have historically low success rates such as in semi-arid and arid rangeland landscapes. The purpose of this research is to assess the efficacy of remote sensing for tracking seedling height, seedling density, and seedling fate, and determine the biotic causes of seedling mortality in a rangeland revegetation site in northwestern Utah. In Chapter 1, we use 28 time-lapse and motion sensing infrared cameras (Reconyx) to measure seedling density and height in fenced and unfenced plots during the initial four months of seedling establishment and growth. We compare imaged-based measurements of seedling height and density with similar measurements collected in the field and at different daylight hours to determine the accuracy and reliability of remotely sensed measurements. We found that the ideal sample periods for capturing the clearest images were at the time the sun passed zenith and shadows were minimized. Average seedling height was 14% lower in image-based versus field estimates. Seedling density was underestimated by approximately 30% when using cameras. Our study establishes that remote sensing of seedlings using time-lapse cameras is a method for seedling research and monitoring in restoration efforts which merits further research and development. In Chapter 2, we track biotic causes of seedling fate using the methods developed in Chapter 1, and compare seedling survival in fenced and unfenced plots. Fencing led to a four-fold increase in the number of seedlings emerged from the soil. Herbivory and damage caused by trampling and burial resulted in the death of 61.4 % of all unfenced seedlings. Fencing plots increased the probability of seedling survival by seven times. Using cameras to track seedling fate at two restoration sites revealed that small herbivores, including Lepus californicus, Thomomys bottae, and Dipodomys sp. drastically reduced seedling survival during the first year after planting. Effects of herbivores on seedling survival should be taken into consideration when planning revegetation operations, and further research can increase knowledge of how herbivory affects restoration efforts. Using cameras can provide meaningful information to managers and researchers about seedling status and fate.
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Rückbeil, Marcia Viviane [Verfasser], Ralf-Dieter Akademischer Betreuer] Hilgers, and Klaus [Akademischer Betreuer] [Willmes. "The impact of bias on test decisions in survival analysis / Marcia Viviane Rückbeil ; Ralf-Dieter Hilgers, Klaus Willmes-von Hinckeldey." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1220729183/34.

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Книги з теми "Survival test"

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(Canada), Environment Canada, ed. Biological test method: Test of larval growth and survival using fathead minnows. Ottawa, Ont., Canada: Environment Canada, 1992.

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2

Newman, Mark. A survivor's memories: A test of everlasting survival. St. Thomas, U.S.V.I: M. Newman, 1993.

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3

(Canada), Environment Canada, ed. Biological test method: Test of reproduction and survival using the cladoceran Ceriodaphnia dubia. Ottawa, Ont., Canada: Environment Canada, 1992.

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4

United States. Flight Standards Service. Parachute rigger knowledge test guide. [Washington, D.C.] (800 Independence Ave., S.W., Washington 20591): U.S. Dept. of Transportation, Federal Aviation Administration, Flight Standards Service, 1995.

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5

United States. Flight Standards Service. Parachute rigger knowledge test guide. Washington, D.C. (800 Independence Ave., S.W., Washington 20591): U.S. Dept. of Transportation, Federal Aviation Administration, Flight Standards Service, 1999.

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6

Canada, Atomic Energy of. Operation Tommyknocker test of survival equipment for underground refuge stations. Pinawa, Man: AECL, Whiteshell Laboratories, 1995.

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7

A test of will: One man's extraordinary story of survival. Winlaw, BC: conXion Books, 2012.

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This is not a test. New York: St. Martin's Griffin, 2012.

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9

Survival guide to professional exams: Preparation tips to ace the test! Peoria, Ill: Bentley Press, 1994.

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Canada, Canada Environment. Biological test method: Test for survival and growth in sediment and water using the freshwater amphipod Hyalella azteca. Ottawa, Ontario: Environment Canada, 2013.

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Частини книг з теми "Survival test"

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Kleinbaum, David G. "Kaplan-Meier Survival Curves and the Log-Rank Test." In Survival Analysis, 45–82. New York, NY: Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4757-2555-1_2.

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2

Xue, Yishu, Elizabeth D. Schifano, and Guanyu Hu. "Online Updating of Nonparametric Survival Estimator and Nonparametric Survival Test." In Emerging Topics in Statistics and Biostatistics, 415–28. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72437-5_18.

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3

Di Marco, P., V. Abbadessa, R. Perricone, and P. Citarrella. "Is Platelet Survival a Predictive Test for Thrombosis?" In Advances in Hemostasis and Thrombosis, 323–26. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4615-9424-6_31.

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Kleinbaum, David G., and Mitchel Klein. "Kaplan-Meier Survival Curves and the Log-Rank Test." In Statistics for Biology and Health, 55–96. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6646-9_2.

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Nikulin, Mikhail, Léo Gerville-Réache, and Xuan Quang Tran. "On Chi-Squared Goodness-of-Fit Test for Normality." In Statistical Models and Methods for Reliability and Survival Analysis, 213–27. Hoboken, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118826805.ch14.

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George, Florence, and Sneh Gulati. "A Universal Goodness-of-Fit Test Based on Regression Techniques." In Statistical Models and Methods for Reliability and Survival Analysis, 21–32. Hoboken, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118826805.ch2.

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Bagdonavičius, Vilijandas. "A New Goodness-of-Fit Test for Shape-Scale Families." In Statistical Models and Methods for Reliability and Survival Analysis, 357–67. Hoboken, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118826805.ch23.

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Martynov, Gennady. "Durbin-Knott Components and Transformations of the Cramér-von Mises Test." In Statistical Models and Methods for Reliability and Survival Analysis, 111–23. Hoboken, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118826805.ch8.

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Kleinbaum, David G., and Mitchel Klein. "Correction to: Kaplan-Meier Survival Curves and the Log-Rank Test." In Statistics for Biology and Health, C1. New York, NY: Springer New York, 2020. http://dx.doi.org/10.1007/978-1-4419-6646-9_11.

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Mezaouer, Amel, Kamal Boukhetala, and Jean-François Dupuy. "A Non-Parametric Test for Comparing Treatments with Missing Data and Dependent Censoring." In Statistical Models and Methods for Reliability and Survival Analysis, 297–310. Hoboken, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118826805.ch19.

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Тези доповідей конференцій з теми "Survival test"

1

Chalfant, T. "8.3 - Ninja Telemetry AMT Survival in a Congested Spectral Environment." In ettc2018 - European Test and Telemetry Conference. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2018. http://dx.doi.org/10.5162/ettc2018/8.3.

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Wan, Ling, Zhen Gao, and Torgeir Moan. "Model Test of the STC Concept in Survival Modes." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23213.

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The STC (Spar Torus Combination) concept combines a Spar floating wind turbine and a torus-shaped heaving-body wave energy converter (WEC). Numerical simulation has shown positive synergy between the WEC and the Spar floating wind turbine in operational conditions. However, in extreme wind and wave conditions, it is challenging to maintain structural integrity, especially for the WEC. To ensure survivability of this concept in extreme conditions, three survival modes have been proposed. To investigate the performance of the STC in extreme conditions, model tests with a scale factor of 1:50 were carried out in the towing tank of MARINTEK, Norway. Two survival modes were tested. In both modes, the Torus WEC was fixed to the Spar. In the first mode, the Torus WEC is at the mean water surface, while in the second mode, the Torus WEC is fully submerged to a specified position. In the tests, 6 D.O.F rigid body motions, mooring line tensions, forces in 3 directions (X, Y and Z) between the Spar and Torus were measured, wind velocity and wind force were also measured by a sensor in front of the model and a load cell installed on the wind disc. In this paper, the model test set-up for the two survival modes are described, and then decay tests, regular wave tests and the statistical tests for wind only, irregular wave only and irregular wave plus wind are presented, compared and analyzed. In the mean water level survival mode, the Torus had a small draft and large water plane area, so slamming and green water were observed as expected. In addition, Mathieu instability phenomena were observed during the regular wave test. In some large wave conditions in the fully submerged mode, no severe wave load occurred. All the results are presented in model scale unless specified, for direct comparison with numerical simulations later.
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Zain, Zakiyah, Nazrina Aziz, and Yuhaniz Ahmad. "Simplifying multivariate survival analysis using global score test methodology." In INNOVATION AND ANALYTICS CONFERENCE AND EXHIBITION (IACE 2015): Proceedings of the 2nd Innovation and Analytics Conference & Exhibition. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937019.

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Pestana Caires, Nidia, Sara Campos Silva, Vania Caldeira, Rita Gerardo, Nicole Murinello, Ana Sofia Santos, Alexandra Borba, et al. "Preoperative Six-Minute-Walk Test in Lung Transplantation: survival predictor." In ERS International Congress 2017 abstracts. European Respiratory Society, 2017. http://dx.doi.org/10.1183/1393003.congress-2017.pa1549.

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Schneider, B., C. Geser, and W. Feuerer. "EFFECT OF ANTICOAGULANT TREATMENT WITH RA-233 (MOPIDAMOLE)ON SURVIVAL IN BRONCHIAL CANCER." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644671.

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RA-233 (mopidamole) is a phosphodiesterase inhibitor that has been -shown previously to limit progression of malignancy in certain experimental animal models and in pilot studies in humans. To test its therapeutic effect a multicenter double blind controlled clinical trial was performed from 1982-1986 with patients suffering from (non small-cell) bronchial cancer. 7 centers participated and the data of 270 patients (147 treated with placebo and 123with RA-233) could be analyzed. Median treatment time was 18 months, median observation time 21 months. With RA-233 treatment survival couldbe increased significantly (Savage-test; p = 0.05 (one sided)) compared to placebo treatment (mean survival time in the RA-233 group 1080 days, in the placebo group 960 days).Cox-analysis showed a significant reduction of the hazard function to 0.6 by RA-233 treatment compared with placebo. As additional significant influence factors of the hazard-function , the postsurgical TNM-class and the histological type could be revealed. Patients from stage T1or T2 and NO survived significantlylonger than patients with other TNM-stages. But there is no interaction between treatment and TNM-class; i.e. RA-233 effect is in all TNM-stages similar. In contrast to survival metastasis-frequency and metastasis-free interval could not be influenced by RA-233.
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Zhao, Xin, and Mingqing Xiao. "Autonomous Decentralized Test System to enhance ATS's survival probability and online maintainability." In 2015 IEEE AUTOTESTCON. IEEE, 2015. http://dx.doi.org/10.1109/autest.2015.7356510.

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Zain, Zakiyah, and John Whitehead. "Survival analysis of cancer patients with multiple endpoints using global score test methodology." In PROCEEDINGS OF THE 3RD INTERNATIONAL CONFERENCE ON MATHEMATICAL SCIENCES. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4882621.

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Zain, Zakiyah, Nazrina Aziz, Yuhaniz Ahmad, Zairul Azwan, Farhana Raduan, and Ismail Sagap. "Survival analysis of colorectal cancer patients with tumor recurrence using global score test methodology." In INTERNATIONAL CONFERENCE ON QUANTITATIVE SCIENCES AND ITS APPLICATIONS (ICOQSIA 2014): Proceedings of the 3rd International Conference on Quantitative Sciences and Its Applications. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4903697.

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Minai, Omar A., Srinivas Mummadi, Ravi Gudavalli, Kevin McCarthy, Meng Xu, and Raed A. Dweik. "Heart Rate Recovery After Six-Minute Walk Test Predicts Survival And Hospitalization In PAH." In American Thoracic Society 2012 International Conference, May 18-23, 2012 • San Francisco, California. American Thoracic Society, 2012. http://dx.doi.org/10.1164/ajrccm-conference.2012.185.1_meetingabstracts.a6737.

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Kuranova, L. L., D. V. Uskalova, A. A. Zhalnina, N. B. Savina, S. N. Koryakin, and E. I. Sarapultseva. "CHANGES IN THE SURVIVAL AND FERTILITY OF THE MODEL TEST ORGANISM AFTER RADIATION IN THE JUVENILE AND PUBERTY PERIODS." In SAKHAROV READINGS 2022: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute of Belarusian State University, 2022. http://dx.doi.org/10.46646/sakh-2022-1-253-256.

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The work analyzes the effect of proton radiation at a dose of 10 Gy on the survival and fertility of crustaceans Daphnia magna. Daphnia were exposed to radiation during the juvenile and pubertal periods of ontogenesis. It has been shown that proton radiation does not affect the survival of crustaceans. The effect of proton radiation is manifested in a change in a more sensitive indicator - fertility. A significant decrease in the fertility of D. magna may be associated with the cytotoxic effect of radiation on germ cells and may affect subsequent generations, which requires additional research.
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Звіти організацій з теми "Survival test"

1

Shedrow-Moore, D. B. Ceriodaphnia survival/reproduction test. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5182643.

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Bleser E., R. Thern, and K. A. Brown. Survival Test of Wires in H-20 Septum. Office of Scientific and Technical Information (OSTI), May 1989. http://dx.doi.org/10.2172/1131585.

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Specht, W. L. F/H Area ETF effluent (H-016 outfall) ceriodaphnia survival/reproduction test, test date: September 21, 1989. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/10136389.

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Specht, W. L. F/H Area ETF effluent (H-016 outfall) ceriodaphnia survival/reproduction test, test date: December 28, 1989. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/10142024.

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Specht, W. L., and J. Stephens. F/H Area ETF effluent (H-016 outfall) Ceriodaphnia survival/reproduction test, test date: December 12, 1990. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/10146641.

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Specht, W. L. F/H Area ETF effluent (H-016 outfall), ceriodaphnia survival/reproduction test, test date: March 21, 1991. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/10149345.

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Specht, W. L. F/H Area ETF effluent (H-016 Outfall) ceriodaphnia survival/reproduction test, Test date: September 18, 1990. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/10151893.

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Specht, W. L. F/H Area ETF effluent (H-016 Outfall) ceriodaphnia survival/reproduction test, Test date: September 18, 1990. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/5083560.

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Specht, W. L. F/H Area ETF effluent (H-016 outfall) ceriodaphnia survival/reproduction test, test date: September 21, 1989. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/5449292.

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Specht, W. L., and J. Stephens. F/H Area ETF effluent (H-016 outfall) Ceriodaphnia survival/reproduction test, test date: December 12, 1990. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/5196676.

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