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  • 學位論文

信用評等改變與盈餘資訊性關聯性之研究

A study on the relationship between credit rating change and earnings informativeness

指導教授 : 陳昭蓉
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摘要


本研究以1999~2008年台灣上市、櫃公司為研究對象,共8,707個公司-年樣本,以臺灣經濟新報社所出版的信用評等風險指標衡量信用評等變動及原因,探討信用評等等級變動與盈餘資訊性的關聯性,並進一步分析信用評等調等原因是否會影響投資人對企業未來資訊的解讀程度。實證結果發現,信用評等升等之未來盈餘反應係數顯著為正,信評降等之未來盈餘反應係數則顯著為負,即信用評等升等增加投資人對於未來資訊的解讀程度,反之,信用評等降等將會使未來不確定性較高,因此,信評降等有較差的盈餘資訊性。另外,投資人對於升等之盈餘資訊性的影響會大於降等的影響,但進一步將信用評等之風險等級劃分較明確之後,信用評等降等的影響則會大於升等的影響。最後,信用評等變動與盈餘資訊性關聯性的影響會因調等理由而有所不同,即信用評等調等原因為營運活動及轉投資效益時,會影響投資人解讀未來資訊的程度。最後,加入控制變數與敏感性測試後,本文仍獲得一致的實證結果。

並列摘要


This research analyzes the samples of Taiwan-listed and over-the-counter companies during the period 1999-2008, excluding banking and insurance industries. Using 8,707 firm-year observations collected from the Taiwan Credit Risk Index(TCRI) measure rating change and reason of change published by Taiwan Economic Journal (TEJ), this study examines the relationship between credit ratings changes and earnings informativeness, and further analysis whether reason of credit rating change varies affect investor on interpretation of the firm’s future information. The empirical results show that firms with rating upgrade have high Future Earnings Response Coefficient (FERC), and with rating downgrade have low FERC, and find that the effect of upgrade rating on FERC is greater than downgrade. After considering the risk classification of credit rating change, this research finds the impact of credit rating downgrades is greater than the upgrade. Finally, the relationships between credit rating change and earnings informativeness differ depend by reason of ratings change. The reason of credit rating change due to operating and investment will affect investor interpretation of the firm’s future information. These findings are robust to controlling for control variables and sensitivity tests, the previous results remain unchanged.

參考文獻


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