of Clustered Data Thai investors are classified into three clusters using investment proportions (Proportions of their money allocated to each investment type) Cash Holder 444 20% Old-Fashioned 1,573

allocated to each investment type e.g. cash deposit, stock market, real estate, gold, TFEX, and T-bond) as clustering variables. Three investor clusters are uncovered, namely, cash holders, old-fashioned

that select Big 4 auditors are firms that have higher reporting quality. As a result, without auditor factors, these firms innate fewer mistakes that require audit adjustments. For auditor factor