5. Research Results
The descriptive statistics and Pearson
correlation are presented in Table 2. The average
audit fee is 2.42 million Baht and the highest and
lowest audit fees are 24.4 million Baht and 0.065
million Baht, respectively. About 64 percent of
sample companies are audited by Big 4 firms. About
65 percent and 27 percent of sample companies
received unqualified opinion and unqualified opinion
with explanation, respectively. Audit fee has
significant positive correlation with Big 4 and
Opinion. This correlation implies that firms with Big 4
auditors pay for higher audit fee than those with nonBig 4 auditors. Furthermore, firms with modified
auditor’s report pay for higher audit fee than those
with clean auditor’s report.