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台灣股市系統性風險之估計與檢定

On the Estimation and Testing of Systematic Risks on Taiwan's Stock Market

摘要


本文使用Fama-French(1992)兩階段迴歸分析,探討影響台灣股市系統性風險係數檢定結果的原因。實證結果顯示,在其他條件不變下,不論以加權平均法或者簡單平均法計算投資組合報酬率,不論市場報酬率是否考慮現金股息,不論樣本是否包含上櫃公司,都不會改變系統性風險係數的檢定結果。然而投資組合分組方式,會強烈地影響組beta的估計值,進而影響第二階段的橫斷面迴歸分析結果。

並列摘要


This paper explores the determinants of the tests on the coefficients of the systematic risks on Taiwan's stock market. The Fama-Frenchfs (1992) two-stage regression analysis is used. The empirical evidence reveals that, ceteris paribus, the conclusions will not be altered no matter (a) the portfolio returns are value- or equally-weighted, (b) the market returns take the account of cash dividends, and (c) the GreTai stocks are included in the sample. However, the estimates of betas are largely affected by the way in which the portfolios are formed in the first stage, so that the results of the second-stage regressions will be affected.

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