Dissertations / Theses on the topic 'Auditor switching'

This dissertation is concerned with a primary and two secondary research issues. The primary issue pertains to the existence of a two-stage auditor switching decision process; that is the auditor change and the auditor selection stages. The two secondary issues concern the relative influence of variables within their respective decision stages. External auditors are engaged not only to comply with the Corporations Law requirement and Australian Stock Exchange membership conditions but also to reduce the degree of information risk assigned by financial statement users to financial statements prepared by auditee management. The decision to switch auditors may cause financial statement users to assign a higher degree of information risk to financial statements, i.e., the indirect costs of switching auditors. A substantial increase in these indirect costs may have occurred as the average rate that Australian publicly listed companies switch auditor has increased in recent years. However, prior research has provided inconsistent and inconclusive evidence with regard to the variables that influence auditees to switch auditors. To avoid mis-perceptions by financial statement users about the newly appointed auditors' attestation of the financial information prepared by auditees, a greater understanding is needed of the auditor switching decision process to assist in mitigating these indirect costs of switching auditors. In prior research the underlying suggestion why auditees switch auditors is the development of a mis-match of audit services demanded to the services supplied by the incumbent auditor. To overcome this mis-match, auditees after deciding to change auditors then select a specific audit firm that offers suitable services and possesses suitable characteristics. A suggested reason for the inconsistent findings of prior research is that there are two decision stages (auditor change and auditor selection) in the auditor switching decision process and past studies have examined, intentionally or otherwise, different decision stages. From a two decision stage perspective, there are three additional explanations for the inconsistent findings of prior research. These explanations are 1) the inappropriate use of surrogate measures for the decision stage studied, 2) the misuse of the terms auditor change, auditor selection and auditor switching, and 3) the inappropriate research methodology and instrument design employed. This absence of a 'shared agreement' among researchers about the two-stage auditor switching decision concept and misuse of terms may have confused not only researchers but also survey participants and readers of auditor switching literature thus contributing to the inconsistencies in prior evidence as well as perpetuating the inconsistent results where the readers are the future researchers. A review of the literature identified five characteristic variables of the incumbent and replacement audit firms that influence the auditor switching decision. Four variables (disagreements between auditees and auditors that result in, or are caused by, the issuance of a qualified audit report and recommendations from three external sources) in addition to the five incumbent auditor characteristics were found to influence only the auditor change decision. In addition to the five replacement auditor characteristic variables, a further five variables, involving audit firm image creation or other promotional activities, have been found to influence the auditor selection decision stage. A primary and two secondary problems regarding the auditor switching decision process are addressed (1) How and to what extent does the impact of the five auditor characteristics on Australian auditees' decisions to change auditors (to terminate the incumbent auditor's appointment) differ from that on auditees' decisions to select the replacement auditor? (2) How and to what extent are the nine variables used by Australian auditee management in the decision to change auditors (to terminate the incumbent auditors appointment)? (3) How and to what extent are the ten variables used by Australian auditee management in the decision to select a replacement auditor? The provision of evidence to support the two-stage auditor switching decision process may be achieved by jointly examining and identifying significant differences in the perceived influence of auditor characteristics across the two decision stages and a comparison of their rank order of influence within each stage. Three empirical models are constructed to investigate these three research questions. Using the MANOVA (within-subjects) design, the first model is to analyse each respondent's perception of the level of influence of each of the five auditor characteristic variables across the two decision stages. The second and third empirical models are using an one-way ANOVA design to test the influence of each of the respective independent variables (i.e., nine variables for the change decision and ten variables for the selection decision) on the respective dependent variable (i.e., the change decision or the selection decision). Fifty-three usable responses were received from Australian companies identified as voluntarily switching auditors for the reporting year ended 1990 and/or 1991. The data collected for analysis were provided by company executives of these companies. The major findings of this study are: 1) Two of the five auditor characteristics, 'level of audit quality' and 'suitability of non-audit services', differed significantly in their level of relative influence across the two decision stages. Furthermore, there was some support in the results for a perceived difference in the influence of a third auditor characteristic, 'size of audit fees', across both stages. 2) Significant differences were perceived in the level of influence of variables on the auditor change decision stage. The six most influential variables were the higher audit fees, the auditor's offices were not located near the auditee's geographically dispersed offices, the incumbent auditor's lack of industry specialisation, a higher audit quality was not provided, the non-audit services offered were unsuitable, and director's recommendations. 3) In the auditor selection decision stage, significant differences were perceived in the level of influence of variables. The six most influential variables were the lower fees, the recommendations of business colleagues, a higher quality audit can be provided, the suitability of range of non-audit services, the closeness of the auditor's offices to the auditee's geographically dispersed operations, and the availability of industry specialisation. 4) A comparison of the rank order of influence of auditor characteristic variables within each decision stage found variances exist for two variables 'closeness of auditor's offices to the auditee's operations' and 'the level of industry specialisation' across the two stages. 5) The significant difference in the level of influence of characteristics of the incumbent and replacement auditors in the first finding suggests that auditors are not perceived as providing homogeneous services. Furthermore, from the significant difference in these auditor characteristic variables within each decision stage in the second and third findings imply that the auditor characteristics of an auditor are not perceived as homogeneous. The following major conclusions are drawn from this study. The evidence from these major findings support the existence of a two-stage auditor switching decision process. The results also show that auditor switching decision makers' perceptions of the variables that influence auditor switching vary across the two decision stages and with the auditor change and auditor selection decisions. Finally, because the characteristics of the auditors vary in their perceived influence across both stages and within each decision stage, these variances suggest the auditor characteristics supplied are perceived to be heterogeneous. This perceived heterogeneity permits audit firms to differentiate their services offered and requires auditees to employ a two-stage auditor switching decision process.

This dissertation is concerned with a primary and two secondary research issues. The primary issue pertains to the existence of a two-stage auditor switching decision process; that is the auditor change and the auditor selection stages. The two secondary issues concern the relative influence of variables within their respective decision stages. External auditors are engaged not only to comply with the Corporations Law requirement and Australian Stock Exchange membership conditions but also to reduce the degree of information risk assigned by financial statement users to financial statements prepared by auditee management. The decision to switch auditors may cause financial statement users to assign a higher degree of information risk to financial statements, i.e., the indirect costs of switching auditors. A substantial increase in these indirect costs may have occurred as the average rate that Australian publicly listed companies switch auditor has increased in recent years. However, prior research has provided inconsistent and inconclusive evidence with regard to the variables that influence auditees to switch auditors. To avoid mis-perceptions by financial statement users about the newly appointed auditors' attestation of the financial information prepared by auditees, a greater understanding is needed of the auditor switching decision process to assist in mitigating these indirect costs of switching auditors. In prior research the underlying suggestion why auditees switch auditors is the development of a mis-match of audit services demanded to the services supplied by the incumbent auditor. To overcome this mis-match, auditees after deciding to change auditors then select a specific audit firm that offers suitable services and possesses suitable characteristics. A suggested reason for the inconsistent findings of prior research is that there are two decision stages (auditor change and auditor selection) in the auditor switching decision process and past studies have examined, intentionally or otherwise, different decision stages. From a two decision stage perspective, there are three additional explanations for the inconsistent findings of prior research. These explanations are 1) the inappropriate use of surrogate measures for the decision stage studied, 2) the misuse of the terms auditor change, auditor selection and auditor switching, and 3) the inappropriate research methodology and instrument design employed. This absence of a 'shared agreement' among researchers about the two-stage auditor switching decision concept and misuse of terms may have confused not only researchers but also survey participants and readers of auditor switching literature thus contributing to the inconsistencies in prior evidence as well as perpetuating the inconsistent results where the readers are the future researchers. A review of the literature identified five characteristic variables of the incumbent and replacement audit firms that influence the auditor switching decision. Four variables (disagreements between auditees and auditors that result in, or are caused by, the issuance of a qualified audit report and recommendations from three external sources) in addition to the five incumbent auditor characteristics were found to influence only the auditor change decision. In addition to the five replacement auditor characteristic variables, a further five variables, involving audit firm image creation or other promotional activities, have been found to influence the auditor selection decision stage. A primary and two secondary problems regarding the auditor switching decision process are addressed (1) How and to what extent does the impact of the five auditor characteristics on Australian auditees' decisions to change auditors (to terminate the incumbent auditor's appointment) differ from that on auditees' decisions to select the replacement auditor? (2) How and to what extent are the nine variables used by Australian auditee management in the decision to change auditors (to terminate the incumbent auditors appointment)? (3) How and to what extent are the ten variables used by Australian auditee management in the decision to select a replacement auditor? The provision of evidence to support the two-stage auditor switching decision process may be achieved by jointly examining and identifying significant differences in the perceived influence of auditor characteristics across the two decision stages and a comparison of their rank order of influence within each stage. Three empirical models are constructed to investigate these three research questions. Using the MANOVA (within-subjects) design, the first model is to analyse each respondent's perception of the level of influence of each of the five auditor characteristic variables across the two decision stages. The second and third empirical models are using an one-way ANOVA design to test the influence of each of the respective independent variables (i.e., nine variables for the change decision and ten variables for the selection decision) on the respective dependent variable (i.e., the change decision or the selection decision). Fifty-three usable responses were received from Australian companies identified as voluntarily switching auditors for the reporting year ended 1990 and/or 1991. The data collected for analysis were provided by company executives of these companies. The major findings of this study are: 1) Two of the five auditor characteristics, 'level of audit quality' and 'suitability of non-audit services', differed significantly in their level of relative influence across the two decision stages. Furthermore, there was some support in the results for a perceived difference in the influence of a third auditor characteristic, 'size of audit fees', across both stages. 2) Significant differences were perceived in the level of influence of variables on the auditor change decision stage. The six most influential variables were the higher audit fees, the auditor's offices were not located near the auditee's geographically dispersed offices, the incumbent auditor's lack of industry specialisation, a higher audit quality was not provided, the non-audit services offered were unsuitable, and director's recommendations. 3) In the auditor selection decision stage, significant differences were perceived in the level of influence of variables. The six most influential variables were the lower fees, the recommendations of business colleagues, a higher quality audit can be provided, the suitability of range of non-audit services, the closeness of the auditor's offices to the auditee's geographically dispersed operations, and the availability of industry specialisation. 4) A comparison of the rank order of influence of auditor characteristic variables within each decision stage found variances exist for two variables 'closeness of auditor's offices to the auditee's operations' and 'the level of industry specialisation' across the two stages. 5) The significant difference in the level of influence of characteristics of the incumbent and replacement auditors in the first finding suggests that auditors are not perceived as providing homogeneous services. Furthermore, from the significant difference in these auditor characteristic variables within each decision stage in the second and third findings imply that the auditor characteristics of an auditor are not perceived as homogeneous. The following major conclusions are drawn from this study. The evidence from these major findings support the existence of a two-stage auditor switching decision process. The results also show that auditor switching decision makers' perceptions of the variables that influence auditor switching vary across the two decision stages and with the auditor change and auditor selection decisions. Finally, because the characteristics of the auditors vary in their perceived influence across both stages and within each decision stage, these variances suggest the auditor characteristics supplied are perceived to be heterogeneous. This perceived heterogeneity permits audit firms to differentiate their services offered and requires auditees to employ a two-stage auditor switching decision process.
Thesis (Masters)
Master of Philosophy (MPhil)
Department of Accounting, Finance and Economics
Griffith Business School
Full Text

Syfte: Inom revisionsbranschen har rapporteringen om ett företags fortlevnad under en lång tid varit ett omtvistat ämne. Detta specifikt till följd av revisorsskandaler, då företag gått i konkurs utan att ha erhållit en fortlevnadsvarning från sin revisor. I redovisningslitteraturen finns det motstridiga argument kring huruvida revisorer anses oberoende eller inte utifrån deras benägenhet att utfärda fortlevnadsvarningar och de finansiella incitament som finns. Uppsatsens syfte är att: Undersöka om det finns något samband mellan utfärdandet av fortlevnadsvarningar och ekonomisk förlust för revisionsbyrån. Metod: Utifrån tidigare forskning har forskningsbara hypoteser deducerats fram, vilka sedan undersökts empiriskt. En kvantitativ metod har använts för att samla in data från svenska företags årsredovisningar åren 2011-2014. Dessa data har sedan testats och analyserats i ett statistikprogram och har därefter redovisats i olika tabeller. Resultat & slutsats: Denna studie har funnit bevis för den självuppfyllande profetian, vilket indikerar att revisorer drar sig för att utfärda fortlevnadsvarningar. Gällande undersökningen kring ekonomiska incitament som hot mot revisorns oberoende, ger denna studie bevis på att storleken på NAS-arvodet kan utgöra ett potentiellt hot. Studiens resultat visar även att det inte finns någon kvalitetsskillnad mellan Big 4 och icke Big 4 revisorer när det gäller utfärdandet av fortlevnadsvarningar. Förslag till fortsatt forskning: Förslag till fortsatt forskning är att kombinera de finansiella faktorerna med de icke finansiella faktorerna för att studera revisorers oberoende. En tredje begränsning med uppsatsen är att vi utgått från revisorns perspektiv, vilket innebär att förslag till fortsatt forskning är att byta till företagens perspektiv eller kombinera dessa. Uppsatsens bidrag: Denna uppsats har bidragit med mer kunskap kring den självuppfyllande profetian, ekonomiska incitaments påverkan på revisorns oberoende. Uppsatsen har även bidragit med ytterligare förståelse kring hur problematiskt det kan vara att utfärda en fortlevnadsvarning.
Aim: The reporting of an organizations going concern has been center for debate during a long period of time. This is mainly due to auditing scandals where organizations have gone bankrupt without a modified going concern opinion from their auditor. In accounting literature there are conflicting claims about whether auditors are considered independent or not due to their tendency to issue a going concern modified opinion and the influence financial incentives have on auditor independence. The aim of this essay is to: Examine if there is a relation between the tendency to issue a going concern modified opinion and the financial loss for the audit firm. Method: From previous research hypotheses have been deduced. These hypotheses have then empirically been studied. A quantitative method was used to gather data from Swedish companies’ annual reports from the year 2011-2014. After gathering the data, it was tested and analyzed with a stats program and then presented in different tables. Result & Conclusions: This study has found evidence of the self-fulfilling prophecy, which indicates that the auditor withdraws from issuing a going concern modified opinion. Regarding the financial incentives as threats of audit independence, this study gives evidence that the size of Non-audit service fees poses a potential threat. The results of the study also show that there is no significant difference in quality between Big 4 and Non-Big 4 auditors regarding the issuance of going concern modified opinions. Suggestions for future research: In this study the financial factors have been taken into account, a combination of both the financial and non-financial factors is the suggestion for future research. A third limitation of this study is that is based upon the auditors’ perspective, therefore a study based solely on the companies' perspective or a combination of both is our suggestion for future research. Contribution of the thesis: This thesis contributes with more knowledge to the accounting literature. The study has provided more knowledge about the self-fulfilling prophecy, financial incentives on audit independence and the quality among Big 4 and non-Big 4 audit firms. This thesis has also contributed to further understanding of how problematic it can be for an auditor to issue a going concern modified opinion.

Ongoing debates within the professional and academic communities have raised a number of questions specific to the international audit market. This dissertation consists of three related essays that address such issues. First, I examine whether the propensity to switch between auditors of different sizes (i.e., Big 4 versus non-Big 4) changes as adoption of International Financial Reporting Standards (IFRS) becomes a more common phenomenon, arguing that smaller auditors have an opportunity to invest in necessary skills and training needed to enter this market. Findings suggest that clients are relatively less (more) likely to switch to (away from) a Big 4 auditor if the client’s adoption of IFRS occurs in more recent years. In the second essay, I draw on these inferences and test whether the change in audit fees in the year of IFRS adoption changes over time. As the market becomes less concentrated, larger auditors becomes less able to demand a premium for their services. Consistent with my arguments, results suggest that the change in audit service fees declines over time, although this effect seems concentrated among the Big 4. I also find that this effect is partially attributable to a differential effect of the auditors’ experience in pricing audit services related to IFRS based on the period in which adoption occurs. The results of these two essays offer important implications to policy debates on the costs and benefits of IFRS adoption. In the third essay, I differentiate Big 4 auditors into three classifications—Parent firms, Brand Name affiliates, and Local affiliates—and test for differences in audit fee premiums (relative to non-Big 4 auditors) and audit quality. Results suggest that there is significant heterogeneity between the three classifications based on both of these characteristics, which is an important consideration for future research. Overall, this dissertation provides additional insights into a variety of aspects of the global audit market.

Statutory audit markets across the EU have recently been reformed, with new Regulation on the Statutory Audits of Public Interest Entities coming into force in June 2016. The Regulation imposes stricter requirements on the audits of Public Interest Entities, as originally defined in the Statutory Audit Directive 2006, with the option for Member States to designate additional entities as public interest. Thus, the exact definition of a Public Interest Entity applied varies across Member States. In the UK the definition has not been widely extended and includes listed firms, credit institutions, and insurance undertakings. Private firms in the UK are therefore currently exempt from the more stringent audit regulations. However, even based on the limited, and often mixed, evidence for the private company audit market, the decision to preclude most private companies from the definition of a Public Interest Entity, effectively excluding them from the new audit reforms, may not be appropriate. This thesis, therefore, undertakes a comprehensive analysis of the UK audit market for private companies, in addition to examining the auditing choices of private companies and the economic consequences of these choices. The UK is specifically examined because it is one of a number of countries that have chosen not to extend the scope of the definition of a Public Interest Entity beyond the one set at the EU level. The findings of this research show that, similar to the audit market for listed firms, the private company audit market in the UK is segmented with Big Four dominance among the largest firms and relatively low levels of auditor switching. As a result of this audit environment, private companies that do switch auditor are found to experience economic consequences in terms of a reduction in their credit ratings. Particularly when the reasons for a switch are unknown to investors. In addition, the thesis provides evidence to suggest that following an auditor switch, firms receive both physical and implicit discounts on their audit fees, with price recovery of these discounts over the following three years. Suggesting that low-balling is also present in this audit market, which in turn raises concerns regarding competitive pricing and levels of auditor independence. In sum, the results of the thesis provide strong support that the definition and scope of a Public Interest Entity needs revisiting both within the UK and across all EU Member States. Moreover, it reinforces the idea of extending some of the more stringent audit requirements introduced by the EU Regulation on the Statutory Audits of Public Interest Entities, to ensure that economically important private firms have sufficient oversight.

Perceptual bi/multi-stability—the phenomenon in which perceptual awareness switches between alternative interpretations of a stimulus—can be elicited by a large range of stimuli. The phenomenon is explored in vision, audition, touch, and even olfaction. The degree to which perceptual switching across visual and auditory bi/multi-stable paradigms depends on common or separate mechanisms remains unanswered. This main question was addressed in the current work by using four ambiguous tasks that give rise to bi/multi-stability and which are thought to involve rivalry at different levels of cognitive processing: auditory streaming and ambiguous-structure-from-motion (low- level tasks), and verbal transformations and ambiguous figures (high-level tasks). It was also investigated if individual differences in executive function (inhibitory control and set-shifting), creativity and personality traits have common relationships with perceptual switching in adults and children. A series of five experiments (four studies) were conducted. In Study 1 (two experiments), perceptual switching behaviour of adult participants was examined in the four perceptual tasks mentioned above. In Experiment 1, participants reported higher switching rates for the ambiguous figure and verbal transformations than for ambiguous motion and auditory streaming. However, in Experiment 2 participants had a higher switching rate in verbal transformations than in auditory streaming, while the switching rates in the two visual tasks did not differ significantly. The correlations between visual and auditory switching rates were similarly inconclusive: in Experiment 1, no cross-modal correlations emerged, while in Experiment 2 there were correlations between ambiguous figure and verbal transformations and between ambiguous motion and verbal transformation. Furthermore, inhibitory control, set-shifting, and creativity correlated with perceptual ii switching rates in some of the perceptual tasks, although not in a consistent manner. In Study 2, the development of perceptual switching was investigated in children in the same four tasks used in Study 1. Findings showed that the number of switches increased with age in all four perceptual tasks, indicating general maturational developments. Executive functions and creativity were not associated with the ongoing perceptual switching, which was similar to what was found in adults. In Study 3, a neuroscientific perturbation approach was used to investigate whether the superior parietal cortex is causally involved in both visual and auditory multistability as a top-down mechanism. Transcranial magnetic stimulation on the anterior and posterior superior parietal cortex did not increase or decrease the median phase durations in response to the ambiguous motion and auditory streaming. These regions were not causally involved in either visual or auditory multistability. Perceptual switching across modalities correlated nevertheless, indicating common perceptual mechanisms. In Study 4, the effects of attentional control and instructions were further investigated in ambiguous motion and auditory streaming. There were strong correlations between perceptual switching in the two tasks, confirming that there are common mechanisms. However, the effects of voluntary attention did not explain the commonalities found. Possibly the commonalities found reflect similar functionalities at more low-level sensorial mechanisms. In conclusion, perceptual switching in vision and audition share common mechanisms. These commonalities do not seem to be due to the same neural underpinning in parietal cortex. Moreover, attentional control does not explain the commonalities found, indicating a more low-level common mechanism or functionality. Perceptual switching across all ages is task-specific, more than modality specific. No central influence of inhibitory control and creativity was constantly associated with perceptual switching regardless of task/modality, supporting the distributed mechanisms hypothesis.

De uppgifter som revisorn presenterar i sin revisionsberättelse bör intressenter och företag ha förtroende för. Revisorn ska vara en oberoende länk mellan intressenter och företag. Läsaren förväntar sig finna eventuella ekonomiska problem i årsredovisningen. Detta är dock inte alltid fallet. Det är viktigt att revisorerna kan göra en pålitlig bedömning över företagets möjligheter till fortsatt drift. Beslut om going concern-varning måste grunda sig på oberoende och god kunskap om företagets situation. En felaktig going concern-varning kan orsaka problem och intäktsbortfall för både företaget och revisionsbyrån. Intressenterna kan förlora förtroendet för företaget och företaget kan i sin tur byta revisor. Studien fokuserar på huruvida revisorerna kan vara sparsamma med att utge going concern-varning för att inte riskera att förlora företaget som klient och därmed förlora revisionsintäkter. Därför undersöker studien om det finns ett samband mellan förlorade revisionsarvoden och utfärdandet av en första going concern-varning bland svenska företag. Studien vill också visa ifall en going concern- varning ökar sannolikheten för konkurs den s.k. självuppfyllande profetian. Ett bidrag till tidigare forskning är att studien beaktar revisionsuppdragets längd i förhållande till going concern-varning. Från databasen Affärsdata har 432 företag selekterats ut från bokslutsåret 2009. Av dessa hade 216 erhållit en going concern- varning. Denna testgrupp har sedan jämförts med en kontrollgrupp med samma antal som varit finansiellt stressade men inte erhållit någon varning. Studien har använt SPSS som statistiskt program för att kunna göra önskade beräkningar. Studiens resultat visar at det finns ett samband mellan en första going concern-varning och revisorbyte. Studien visar också att längden på revisionsuppdraget påverkar benägenheten att ge en going concern-varning. Däremot finner undersökningen inte något belägg för den s.k. självuppfyllande profetian.
The information that the auditor provides in their audit report should be valid in the eyes of the stakeholders of the company. The auditor should be the independent link between the company and its stakeholders. When reading the audit report, one expects to find all the possible economic problems identified in it, however this is not always the case. It is crucial that the audit of a company’s going concern is reliable. Decisions regarding going concern-modified opinions should be independent and be based on valid information regarding the company’s economic situation. One faulty going concern-modified opinion can set off a whole range of issues and revenue loss for both the company and the audit firm. Consequently stakeholders can lose their trust in the company resulting in a change of audit firm. This thesis is focused on whether or not auditors might be reluctant to hand out going concern-modified opinions in fear of losing a client and the revenue associated with it. Therefore, the thesis investigates whether or not there is a relationship between lost revenue and the first instance of issuing a going concern-modified opinion for Swedish companies. This thesis is also investigating whether the issuance of a going concern-modified opinion will increase the possibility of the company going bankrupt, the so-called self-fulfilling prophecy. A contribution to the previous research regarding the going concern issue is the consideration of audit tenure. We have used 432 companies with fiscal year 2009 extracted from the database Affärsdata. Out of this selection, 216 had been issued a going concern-modified opinion. This test group is then compared to the control group with the same number of companies that were identified as financially distressed but without receiving a going concern- modified opinion. The thesis has used the statistical program SPSS to complete the calculations needed to complete the analysis. The result shows a positive relationship between the first going concern-modified opinion and the change of audit firms. The period of time the auditing requires also effects the predisposition to issue a going concern-modified opinion. However the study was unable to find any statistical evidence for the so-called self-fulfilling prophecy.

This work describes the design of audio amplifiers operating in switching mode. The first part describes basic principles of the power stage switching concept. There is described differences between classes of amplifiers according to technology. The second larger part includes design and construction of the switching amplifiers. Design is implemented, including the preamplifier and power supply. Power supply works in switching mode. The measured parameters of the proposed facility are given in the last part.

This diploma thesis deals with digital audio amplifier with universal inputs and its design. The first part describes modulation and audio formats for audio electronics. The thesis contain design of a block diagram of the digital audio amplifier and describes the requirements for functional blocks. As a basic device for audio signal processing was choosen integrated circuit STA326. The thesis continue with circuits design for each blocks with a description of their principles. The next section describes the construction and firmware for microcontroller. The last part of this diploma thesis is targeted on the presentation of the measured parameters of the amplifier. The conclusion summarizes the results that have been achieved and advantages and disadvantages of the digital audio amplifier prototype.

Text in English
This study explores the phenomenon of auditor switching. The purpose of this study is to further contribute to the auditor switching literature by examining the reasons client companies in South Africa switch auditors, where the topic has not previously been studied and following a period of rapid and significant change in the auditing profession. Using previous literature as a foundation, forty-four variables that contribute to auditor switching are presented and tested based on empirical data elicited by means of a questionnaire survey of sample companies that experienced auditor switching during the period 1 January 1998 to 30 June 1999 as obtained from Practitioners in the KwaZulu-Natal Region. The factors motivating auditor switching were based on a questionnaire response of seventy-five companies (response rate 67% ). The empirical study also tested whether or not the switch variables thus identified are statistically related to auditor switching. The findings of this study revealed that audit fees are both the most frequently cited reason for switching auditors and found to be statistically significant at the 0.05 level of significance. Dissatisfaction over the overall quality of services provided by the auditor, lack of communication including the lack of responsiveness to client needs, poor working relationship with audit partner followed as switch factors but were not found to be statistically significant at 0. 05 level. The findings of this study revealed that two other variables, namely, management change and the need for group auditor rationalisation, appear to be significantly related to auditor switching at the 0.05 1evel of significance.
Auditing
M. Comm. (Auditing)

碩士
國立交通大學
管理學院碩士在職專班管理科學組
95
This study aims to explore how the audit opinion would be influenced by auditors’ joint provisions of the audit and non-audit services, auditor switching, the price war in the audit fees and concentration of directors’ shareholdings. The relation between the influence and the independence of auditor will be further discussed. The evidence indicates that auditors prefer to provide standard unqualified audit reports for companies with higher ratio of non-audit fees, greater insider ownership. Auditors provide standard unqualified opinions when there is non-audit service provided, because the auditors might benefit from the company according to the factor of economic. The research has also discovered that qualified audit report and auditor switching is closely linked. It implies that companies which received the qualification opinion intend to switch auditors. The results suggest that the independence of auditors is harmed through auditor non-audit fees and auditor consecutive engagement.

碩士
國立中興大學
會計學研究所
99
Auditor switching has been an extensively discussed academic issue, and the results change with the time and the background. This study suggests that the earnings management behavior and the financial position of the company before and after initial public offering will affect a company’s auditor switching decision. Therefore, this study combines the initial public offering issue with the auditor witching issue and investigates the determinants of initial auditor switching after the company went public. This study suggests that the audit quality offered by the same-sized audit firm is similar and therefore focuses on auditor switching between different-sized firms. This study adopts companies as samples which not only had initial public offerings from 1991 to 2010 but also switched auditors afterwards. The Logistic regression is adopted to examine the hypotheses. The empirical results indicate that, after the companies had the initial public offerings, when they had declining performance and frequent management change, they switched their auditors from a big firm to a non- big firm. And when they got bigger in size, they switched auditors from a non- big firm to a big firm.

碩士
國立彰化師範大學
會計學系
102
In recent years, many companies restated financial statement frequently, affecting the usefulness of the financial statements seriously and the public trust, making people doubted the quality of financial statements. Therefore, the issues of restatement have caused the attention of accountants, banks and regulatory authorities. Current literature of financial restatement indicated that companies are more likely to switch auditors when the financial restatement occurs. This paper further explored the quality of financial statement after changing auditor accompanied by restating financial statements. Furthermore, this paper discusses that whether the switching style of auditor affect the quality of financial statement. The empirical results show that companies which restated financial statements replacing the current auditor will improve the quality of financial statements. Additionally, the switching style of the auditor will affect the quality of the financial statements. When company switched the non-big four auditors to the Big Four auditors and switched from the Big Four auditors to another big four auditors the quality of financial statements is improved.

碩士
國立臺北大學
會計學系
91
The main purpose of this study is to investigate the relationship of auditor switching and audit quality. We analyze auditors’ attitude for management’s accounting treatment, and focus on the difference of audit quality when companies switch incumbent auditors. Z This study selects 59 companies （236 samples）between 1999 and 2001 in Taiwan . It takes the industry cross-sectional modified Jones model to estimate abnormal accruals as proxy variables for audit quality, and uses multivariate tests to analyze abnormal accruals in each of the last two years with the predecessor auditors and the first two years with the successor auditors. Z The results indicate that, before companies change auditors, auditors prefer conservative accounting choices in the last year with the predecessor auditors. However, we did not find out any difference of audit quality in year-1 to year 1, and we did not find out successor auditors’ attitude become less conservative, neither.

碩士
國立彰化師範大學
會計學系
100
Recently, the occurrence of finacial restatement has increased dramatically. The erosion in the quality of financial reporting as evidenced by the proliferation of finacial restatement has caused the attention of regulators, audit firms, and companies. Literature of finacial restatement indicated that the switch of relationship between auditor and client when the finacial restatement occurs. This study investigates whether the warning in the audit opionin before the finacial restatement occurs affects the possibility of auditor switching. Additionally, the board of directors plays the core role in the corporate governance. The board of directors is responsible for hiring an external auditor. This study also investigates whether the corporate governance mechanisms affects the possibility of auditor switching when auditor is unable to warn before the finacial restatement. The empirical results indicate that the auditor is less likely to be dismissed when he makes the warning before the financial restatement. Furthermore, our result also suggests that the lower ratio of insiders on the board and the higher ratio of board seats held by outside directors, the higher probability of auditor switching in the event of financial restatement. In other words, with the improvement of corporate government, the company is more likely to choose high-quality auditor.

碩士
國立臺灣大學
會計學研究所
84
The main purpose of this research is to examine whether the newly listed firms will employ more credible auditors,if auditor switching occurred prior to the public offering,and to investigate the relationship between underwriter prestige and auditor switching in Taiwan. We make conclusions from this empirical research as follows.First, the newly listed firm tents to replace a small auditor with a more reputable one, if auditor switching occurred prior to the public offering.Second, there is no significant relationship between underwriter prestige and auditor switching of newly listed firms.Third,the smaller the firm size, the more likely the newly listed firm switches to reputable auditor. Fourth,the average rate of sale growth is not significantly related to the auditor credibilty, while the observed sample is defined as those who changed the auditor during the four years before the public offering. However, the average rate of sale growth is negatively related to the auditor credibilty, if the observed sample is defined as those who changed the auditor during the three years before the public offering. Finally, the firm age is negatively related to the auditor credibility, when the newly listed firm switched the auditor prior to the public offering.

碩士
國立中正大學
會計與資訊科技研究所
103
This paper examines the relationship among switching costs, agency costs and auditors’ tenure during 2003 to 2013. Our country implements mandatory auditor-partner rotation regime in 2003 to enhance auditor independence and abridging the relationship between auditors and client. However, auditors’ cooling periods are not included in this auditor-partner rotation regime, which makes part of audit client and their former auditors still maintain their relationship with each other. Therefore, in 2009, the revised regime of auditor-partner rotation is implemented again in SAS No.46. Under this unique background in Taiwan, this paper explores the relationship among switching costs, agency costs, which are the demand factors and auditors’ tenure. The empirical results are that: in auditors one, switching costs (auditors’ accumulated tenure and discretionary Accruals) have a greater impact on auditor’s tenure and they are positive significant correlations. In auditors two, switching costs (company’s total assets and auditors’ accumulated tenure) have a greater impact on auditor’s tenure and they are positive significant correlations. As to auditors whose tenure beyond the mandatory tenure, agency costs (numbers of subsidiaries and numbers of board of directors) have a greater impact on auditor’s tenure.

碩士
淡江大學
會計學系
90
Abstract: When the demand for auditing methods within a company has changed, the most frequent step taken by the company is to switch its auditor. Majority of the research studies done on this topic in Taiwan is to find out the underlining reasons why companies switched their auditor. Because of TSE listed and OTC Registered companies are regulated by government agencies, local and state laws, and also by national security exchange corporations, there are only a handful of cases where these companies switched their auditors. For that reason, the results produced by these studies are probably inaccurate due to the small number of test cases available. Therefore, by focusing our research on publicly offered companies, which are less strictly regulated, we hope to find out the real reasons why companies took such a step. This research focuses on publicly offered companies and the associated accounting firms. It identifies the factors produced by the company and those resulted from the accounting firm that cause the company to switch its auditor. Our research was done by obtaining relevant data via surveys and analysis done on the basis of the information acquired from organization context. Chi-square test, factors analysis, one-way ANOVA analysis, and logistic regression were also used to process the data to obtain the reasons acknowledged by publicly offered companies and the associated accounting firms respectively as to why a publicly offered company would switch its auditor. We have obtained the following results: 1. The organization context has a relationship with the categories in the survey. 2. Factors analysis revealed that certain differences exist between the reasons for changing auditors believed by publicly offered companies and those believed by the accounting firms. 3. The differences among organization context of individual companies have caused factors identified by them to switch their auditors. 4. From factors analysis, we can conclude that how a company is operated and its future development are the two primary factors why a company switch its auditors. On the other hand, results from the study of the organization context have revealed that the services offered by the company, the number of years since its operation, and its industry would also produce obvious effects for a publicly offered company in its decision to switch its auditors.

The need for high performance circuits in systems with low-voltage and low-power requirements has exponentially increased during the few last years due to the sophistication and miniaturization of electronic components. Most of these circuits are required to have a very good efficiency behavior in order to extend the battery life of the device. This dissertation addresses two important topics concerning very high efficiency circuits with very high performance specifications. The first topic is the design and implementation of class D audio power amplifiers, keeping their inherent high efficiency characteristic while improving their linearity performance, reducing their quiescent power consumption, and minimizing the silicon area. The second topic is the design and implementation of switching voltage regulators and their controllers, to provide a low-cost, compact, high efficient and reliable power conversion for integrated circuits. The first part of this dissertation includes a short, although deep, analysis on class D amplifiers, their history, principles of operation, architectures, performance metrics, practical design considerations, and their present and future market distribution. Moreover, the harmonic distortion of open-loop class D amplifiers based on pulse-width modulation (PWM) is analyzed by applying the duty cycle variation technique for the most popular carrier waveforms giving an easy and practical analytic method to evaluate the class D amplifier distortion and determine its specifications for a given linearity requirement. Additionally, three class D amplifiers, with an architecture based on sliding mode control, are proposed, designed, fabricated and tested. The amplifiers make use of a hysteretic controller to avoid the need of complex overhead circuitry typically needed in other architectures to compensate non-idealities of practical implementations. The design of the amplifiers based on this technique is compact, small, reliable, and provides a performance comparable to the state-of-the-art class D amplifiers, but consumes only one tenth of quiescent power. This characteristic gives to the proposed amplifiers an advantage for applications with minimal power consumption and very high performance requirements. The second part of this dissertation presents the design, implementation, and testing of switching voltage regulators. It starts with a description and brief analysis on the power converters architectures. It outlines the advantages and drawbacks of the main topologies, discusses practical design considerations, and compares their current and future market distribution. Then, two different buck converters are proposed to overcome the most critical issue in switching voltage regulators: to provide a stable voltage supply for electronic devices, with good regulation voltage, high efficiency performance, and, most important, a minimum number of components. The first buck converter, which has been designed, fabricated and tested, is an integrated dual-output voltage regulator based on sliding mode control that provides a power efficiency comparable to the conventional solutions, but potentially saves silicon area and input filter components. The design is based on the idea of stacking traditional buck converters to provide multiple output voltages with the minimum number of switches. Finally, a fully integrated buck converter based on sliding mode control is proposed. The architecture integrates the external passive components to deliver a complete monolithic solution with minimal silicon area. The buck converter employs a poly-phase structure to minimize the output current ripple and a hysteretic controller to avoid the generation of an additional high frequency carrier waveform needed in conventional solutions. The simulated results are comparable to the state-of-the-art works even with no additional post-fabrication process to improve the converter performance.