Articlegold2021

Bayesian inference of local government audit outcomes

Wilson Tsakane Mongwe · Rendani Mbuvha · Tshilidzi Marwala

26 citations0/0 files storedPLoS ONE

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Auditing, Earnings Management, Governance Corporate Governance and Financial Management Benford’s Law and Fraud Detection

Abstract

The scandals in publicly listed companies have highlighted the large losses that can result from financial statement fraud and weak corporate governance. Machine learning techniques have been applied to automatically detect financial statement fraud with great success. This work presents the first application of a Bayesian inference approach to the problem of predicting the audit outcomes of financial statements of local government entities using financial ratios. Bayesian logistic regression (BLR) with automatic relevance determination (BLR-ARD) is applied to predict audit outcomes. The benefit of using BLR-ARD, instead of BLR without ARD, is that it allows one to automatically determine which input features are the most relevant for the task at hand, which is a critical aspect to consider when designing decision support systems. This work presents the first implementation of BLR-ARD trained with Separable Shadow Hamiltonian Hybrid Monte Carlo, No-U-Turn sampler, Metropolis Adjusted Langevin Algorithm and Metropolis-Hasting algorithms. Unlike the Gibbs sampling procedure that is typically employed in sampling from ARD models, in this work we jointly sample the parameters and the hyperparameters by putting a log normal prior on the hyperparameters. The analysis also shows that the repairs and maintenance as a percentage of total assets ratio, current ratio, debt to total operating revenue, net operating surplus margin and capital cost to total operating expenditure ratio are the important features when predicting local government audit outcomes using financial ratios. These results could be of use for auditors as focusing on these ratios could potentially speed up the detection of fraudulent behaviour in municipal entities, and improve the speed and quality of the overall audit.

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References

2003The Fall of Enron 2011Financial Statement Fraud Detection: An Analysis of Statistical and Machine Learning Algorithms 2010Identification of fraudulent financial statements using linguistic credibility analysis 2011Using Financial Statement Data To Identify Factors Associated With Fraudulent Financial Reporting 2010The relation between earnings management and financial statement fraud 2003A fuzzy neural network for assessing the risk of fraudulent financial reporting 2010A computational model for financial reporting fraud detection 2002Enron and the Dark Side of Shareholder Value

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