Copulas are multivariate probability distributions, as well as functions which link marginal distributions to their joint distribution. These functions have been used extensively in finance and more recently in other disciplines, for example hydrology and genetics. This study has two components, (a) the development of copula-based mathematical tools for use in all industries, and (b) the application of distorted copulas in structured finance. In the first part of this study, copulabased conditional expectation formulae are described and are applied to small data sets from medicine and hydrology. In the second part of this study we develop a method of improving the estimation of default risk in the context of collateralized debt obligations. Credit risk is a particularly important application of copulas, and given the current global financial crisis, there is great motivation to improve the way these functions are applied. We compose distortion functions with copula functions in order to obtain greater flexibility and accuracy in existing pricing algorithms. We also describe an n-dimensional dynamic copula, which takes into account temporal and spatial changes. / Thesis (Ph.D.) - University of Adelaide, School of Mathematical sciences, 2009

The purpose of this PhD thesis is to make a contribution to existing knowledge in the field of critical accounting by studying credit mechanisms and their link to income/wealth inequality in Sri Lankan society and the role of accounting technology in facilitating such mechanisms. The literature review revealed that: a) Global inequality is aggravated by the disparity of economic development which is possible only through state intervention; b) Unemployment is considered as a dilemma for economic development in developing countries by most politicians/administrators/researchers; c) In any country, around 60-70 percent of employment is generated by small and medium sized enterprises (SMEs) and; d) Their major problem is access to credit. This research was designed to find out how the credit system works and why certain SMEs do not have adequate access to credit to develop their businesses; to provide employment; to increase the share of national income to the lower income groups; to narrow down the gap between the rich and poor within and between countries. A case study research approach was followed to extract data on real-life experiences of the research participants. Reliability of data was ensured by using various verification techniques and maximum efforts were made to balance the two extremes of validity of the research; internal and external. The extent of representation by the cases and the bank was tested, and judged as high, with 12-14 characteristics common to the Sri Lankan credit culture and banking industry respectively. Marxian critical theories were used for theoretical guidance throughout the research. The three case studies provide empirical evidence for the existence of the discriminatory nature of credit decision-making where two credit applicants were successful but a third credit applicant failed in obtaining credit. It is contended that the two successful applicants were powerful enough to approach a more powerful bank Chairperson and to obtain credit outside the normal credit rules with the support of accounting technology and using masks such as patriotism and social responsibility. The other applicant, who was initially accommodated with credit at the lower level, could not convince the credit decision-makers at the higher level with expensive professionally prepared accounting reports. This applicant was not from an influential social network and could not reach the powerful credit decision-makers informally was rejected through strict application of credit rules. Deep analysis of these facts supports the Marxian claim that credit and exploitation mechanisms work towards concentration of wealth and sustaining income inequality. Credit decisions supply money to influential individuals and it is argued that such economic power enhances the social powerbase of those individuals, which in turn reinforces the propensity to make preferential credit decisions, thereby making them richer. In contrast, a lack of money translates into powerlessness, deprivation and exclusion from social activities for the majority of the poor. In this process opportunities are lost to disadvantaged social groups and this necessarily results in poor people’s economic status remaining stagnant. These power-driven, discriminatory decision-making systems not only restrict the availability of financial capital for feasible projects, but also deny credit to potential enterprises. Further, wasting resources on unfeasible projects, while ignoring the need for nurturing potentially viable projects, are a double blow to efforts towards employment generation and economic development and therefore, are detrimental to the economic well-being of the general population. These findings provide insight for policy formulators for more productive financial capital mobility systems in Sri Lanka. It is suggested that suitable State intervention in regulating SME financing could remove such credit-related obstacles to economic development, and work towards a fair distribution of economic benefits to the people in Sri Lanka and beyond.

This work empirically examines six structural models of the term structure of credit risk spreads: Merton (1974), Longstaff & Schwartz (1995) (with and without stochastic interest rates), Leland & Toft (1996), Collin-Dufresne & Goldstein (2001), and a constant elasticity of variance model. The conventional approach to testing structural models has involved the use of observable data to proxy the latent capital structure process, which may introduce additional specification error. This study extends Jones, Mason & Rosenfeld (1983) and Eom, Helwege & Huang (2004) by using implicit estimation of key model parameters resulting in an improved level of model fit. Unlike prior studies, the models are fitted from the observed dynamic term structure of firm-specific credit spreads, thereby providing a pure test of model specification. The models are implemented by adapting the method of Duffee (1999) to structural credit models, thereby treating the capital structure process is truly latent, and simultaneously enforcing cross-sectional and time-series model constraints. Quasi-maximum likelihood parameter estimates of the capital structure process are obtained via the extended Kalman filter applied to actual market trade prices on 32 firms and 200 bonds for the period 1994 to 2000. / We find that including an allowance for time-variation in the market liquidity premium improves model specification. A simple extension of the Merton (1974) model is found to have the greatest prediction accuracy, although all models performed with similar prediction errors. At between 28.8 to 34.4 percent, the root mean squared error of the credit spread prediction is comparable with reduced-form models. Unlike Eom, Helwege & Huang (2004) we do not find a wide dispersion in model prediction errors, as evidenced by an across model average mean absolute percentage error of 22 percent. However, in support of prior studies we find an overall tendency for slight underprediction, with the mean percentage prediction error of between -6.2 and -8.7 percent. Underprediction is greatest with short remaining bond tenor and low rating. Credit spread prediction errors across all models are non-normal, and fatter tailed than expected, with autocorrelation evident in their time series. / More complex models did not outperform the extended Merton (1974) model; in particular stochastic interest-rate and early default accompanied by an exogenous write-down rate appear to add little to model accuracy. However, the inclusion of solvency ratio mean-reversion in the Collin-Dufresne & Goldstein (2001) model results in the most realistic latent solvency dynamics as measured by its implied levels of asset volatility, default boundary level, and mean-reversion rate. The extended Merton (1974) is found to imply asset volatility levels that are too high on average when compared to observed firm equity volatility. / We find that the extended Merton (1974) and the Collin-Dufresne & Goldstein (2001) models account for approximately 43 percent of the credit spread on average. For BB rated trades, the explained proportion rises to 55 to 60 percent. For investment grade trades, our results suggest that the amount of the credit spread that is default related is approximately double the previous estimate of Huang & Huang (2003). / Finally, we find evidence that the prediction errors are related to market-wide factors exogenous to the models. The percentage prediction errors are positively related to the VIX and change in GDP, and negatively related to the Refcorp-Treasury spread.

The purpose of this PhD thesis is to make a contribution to existing knowledge in the field of critical accounting by studying credit mechanisms and their link to income/wealth inequality in Sri Lankan society and the role of accounting technology in facilitating such mechanisms. The literature review revealed that: a) Global inequality is aggravated by the disparity of economic development which is possible only through state intervention; b) Unemployment is considered as a dilemma for economic development in developing countries by most politicians/administrators/researchers; c) In any country, around 60-70 percent of employment is generated by small and medium sized enterprises (SMEs) and; d) Their major problem is access to credit. This research was designed to find out how the credit system works and why certain SMEs do not have adequate access to credit to develop their businesses; to provide employment; to increase the share of national income to the lower income groups; to narrow down the gap between the rich and poor within and between countries. A case study research approach was followed to extract data on real-life experiences of the research participants. Reliability of data was ensured by using various verification techniques and maximum efforts were made to balance the two extremes of validity of the research; internal and external. The extent of representation by the cases and the bank was tested, and judged as high, with 12-14 characteristics common to the Sri Lankan credit culture and banking industry respectively. Marxian critical theories were used for theoretical guidance throughout the research. The three case studies provide empirical evidence for the existence of the discriminatory nature of credit decision-making where two credit applicants were successful but a third credit applicant failed in obtaining credit. It is contended that the two successful applicants were powerful enough to approach a more powerful bank Chairperson and to obtain credit outside the normal credit rules with the support of accounting technology and using masks such as patriotism and social responsibility. The other applicant, who was initially accommodated with credit at the lower level, could not convince the credit decision-makers at the higher level with expensive professionally prepared accounting reports. This applicant was not from an influential social network and could not reach the powerful credit decision-makers informally was rejected through strict application of credit rules. Deep analysis of these facts supports the Marxian claim that credit and exploitation mechanisms work towards concentration of wealth and sustaining income inequality. Credit decisions supply money to influential individuals and it is argued that such economic power enhances the social powerbase of those individuals, which in turn reinforces the propensity to make preferential credit decisions, thereby making them richer. In contrast, a lack of money translates into powerlessness, deprivation and exclusion from social activities for the majority of the poor. In this process opportunities are lost to disadvantaged social groups and this necessarily results in poor people’s economic status remaining stagnant. These power-driven, discriminatory decision-making systems not only restrict the availability of financial capital for feasible projects, but also deny credit to potential enterprises. Further, wasting resources on unfeasible projects, while ignoring the need for nurturing potentially viable projects, are a double blow to efforts towards employment generation and economic development and therefore, are detrimental to the economic well-being of the general population. These findings provide insight for policy formulators for more productive financial capital mobility systems in Sri Lanka. It is suggested that suitable State intervention in regulating SME financing could remove such credit-related obstacles to economic development, and work towards a fair distribution of economic benefits to the people in Sri Lanka and beyond.

Thesis (Ph.D.)--Murdoch University, 2005. / Thesis submitted to the Division of Arts. Bibliography: p. 301-321.

Thesis (M.B.A.)--University of Hong Kong, 1996. / Includes bibliographical references.

Thesis (M. Sc.)--University of Hong Kong, 1990.

Thesis (Ph. D.)--Princeton University, 2001. / Includes bibliographical references (leaves 110-112).

"Incorporates a part of my doctoral dissertation submitted to and approved by the University of London."--Pref. / Bibliography: p. 347-352.

<p>Today all private corporations are obligated by statutory audit. The government of Sweden appointed an investigation to conclude if the audit should be statutory or not. The investigator presented on the third of April 2008 a report (SOU 2008:32) that suggests abolishment of the statutory audit for approximately 97 % of all private corporations in Sweden. This will result in certain effects on the banks credit rating because of the fact that the banks trust the audited accounts to have been audited by an independent audit.</p><p>The most important in the banks credit rating are: personal judgement, business concept, business plan and repayment ability. The banks also use the private corporations audited accounts in its credit rating.</p><p>We conducted a case study by interviewing four bank officials in different banks in Skövde and Tibro. The purpose of the study was to investigate the banks credit rating and the audits importance in the credit rating.</p><p>The conclusion deducted from our case study it that the confidence between the bank and the company is very high valued and that the audit is a sign of quality.</p>