儘管審計委員會可幫助公司價值的提升,我國目前並未強制設置審計委員會,因此本研究想探討哪些決定因素可能促使公司自願設置審計委員會,並更進一步探討審計委員會品質的決定因素。 本研究以國內上市櫃公司為對象,將可能影響公司自願設置審計委員會及審計委員會品質的決定因素分為三大類別探討,包括公司特質因素、公司治理因素及股權結構因素。在探討自願設置審計委員會決定因素的部分,排除未設置獨立董事及因發行美國存託憑證而設置審計委員會的公司樣本值,以羅吉斯迴歸分析。而探討審計委員會品質的部分,以六項指標的總分衡量審計委員會品質,包括審計委員會規模、成員會計或財務專長、召集人是否具備會計或財務專長、開會次數、成員實際出席率及成員兼任公司數,以order probit迴歸分析。 實證結果顯示,當公司董事會獨立性越高、董事會規模越大、董事長與總經理非同一人、董監持股越低、法人持股越高、在海外發行有價證券,以及電子業、非官股性質的公司越可能自願設置審計委員會。另外,當董事會獨立性越高、董事會規模越大、公司規模越大時,審計委員會品質越高,而在海外發行有價證券的公司審計委員會品質則越低。此外,考量審計委員會品質為一綜合性指標,將衡量品質的六項指標分開探討後,發現審計委員會規模為衡量審計委員會品質最明顯的衡量指標,召集人擁有會計或財務專長為衡量審計委員會品質最不明顯的指標。
In spite that the audit committee can enhance the value of the company, audit committee formation is not mandatory. Accordingly, this study is to investigate which determinants may encourage companies to voluntarily have the audit committee, and further explores the determinants of the quality of the audit committee. The determinants of domestic listed companies are divided into three main categories, including the factor of the company characteristics, corporate governance and the ownership structure. To explore the determinants of voluntary audit committee formation, I exclude the one which do not have independent directors and which has issued American Depositary Receipts. We analyze it using the logit regression. To explore the determinants of quality of audit committee, we use the score of six indicators, including the size of the audit committee, members having accounting or financial expertise, conveners having accounting or financial expertise, frequency of meetings, members’ attendance and number of members serving the independent directors. We analyze it using the order probit regression. The results implicate that voluntary formation of audit committee is associated with higher independence of the board of directors, greater size of the board, separation of the chairman of the directors and the managers, lower ownership of the directors and the supervisors, higher ownership of the institutional investors, issuance of securities overseas, as well as the electronic industry and non-government-owned companies. In addition, I separate the six indicators and find that the size of the audit committee is the most obvious measure of the quality of audit committee, and which the convener having accounting or financial expertise is the least one.