921地震對臺灣股票報酬率是否有非對稱性及結構性改變之探討_

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題名：	921地震對臺灣股票報酬率是否有非對稱性及結構性改變之探討
書刊名：	中山管理評論
作者：	蔡群立／陳淑儀／何志欽
作者(外文)：	Tsai, Chun-li／Chen, Su-yi／Ho, Chih-chin
出版日期：	2014
卷期：	22:4
頁次：	頁711-758
主題關鍵詞：	極值理論；921地震；尾端風險值；非對稱性改變；結構性改變；Extreme value theory；921 Earthquake；Tail risk value；Asymmetric change；Structural change
原始連結：	連回原系統網址
相關次數：	被引用次數:期刊(1) 博士論文(0) 專書(0) 專書論文(0) 排除自我引用:1 共同引用:0 點閱:12

本文是應用極值理論，檢定台灣二十六個產業報酬率之極端風險值，是否因921地震而有所改變，我們分別觀察尾端指數與尾端分位數是否會因921地震而有顯著改變；換言之，本文關心921地震前、後，各產業指數上漲及下跌風險是否具一致性，這為「結構性改變」檢定；另一方面，我們分別探討台灣產業之左尾端分位數（下降風險值）在921地震前（後）是否和右尾端分位數（潛在上升風險值）有所差異，這稱為「非對稱性改變」檢定。本文也進一步探討產業與市場大盤加權指數、及兩兩產業間的共同超額機率，是否會因921地震而存在結構性及非對稱性改變。研究結果發現921地震後，大多產業報酬率之下降風險大於潛在上升風險值，且產業指數之下降風險及潛在上升風險均有顯著增加，此結果顯示台灣大多產業極端風險值存在結構性改變，且921地震過後，產業極端風險值之非對稱性更為顯著。另外，我們發現兩兩產業間之共同上漲及共同下跌之機率，於921地震前、後均無顯著差異；然而，921地震過後，兩兩產業間共同下跌的機率則都顯著高於共同上漲的機率。

以文找文

This paper applies ＂extreme value theory＂ to test if tail risk values of 26 industries in Taiwan's stock market change due to 921 Earthquake. We test if tail index and tail quantile significantly change due to 921 Earthquake, respectively. That is, our paper concerns if downside risk and upward potential risk for each sectoral index are consistent prior to and posterior 921 Earthquake. This is called ＂Structural Change test＂. On the other side, we test if left tail quantile (downside risk) is the same with the right tail quantile (upward potential risk) before (and after) 921 Earthquake, respectively. This is called ＂Asymmetric change test＂. Besides, this paper future tests if the co-exceedance probabilities for sectoral indices with respect to market weigthet index, and for paris of sectoral indices have structural and asymmetric changes prior to and posterior 921 Earthquake. Our empirical results indicate downside risks are significantly larger than upward risks for most industries posterior to 921 Earthquake. Both downside risks and upward potential risks significantly increase after the 921 Earthquake. These findings imply 921 Earthquake causes the tail risk values to have structural change on most sectoral indices. On the other hand, after 921 Earthquake, the asymmetries of tail risk values are more significant. Besides, we find the probabilities of simultaneous booms or simultaneous crashes for pairs of sectoral indicies before 921 Earthquake are not significantly different from those after 921 Earthquake. However, the probabilities of simultaneous crashes for pairs of sectoral indicies after 921 Earthquake are significantly larger than those of simultaneous booms.

以文找文

期刊論文
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1.	Auffret, P.(2003)。Consumption Volatility: The Impact of Natural Disasters?。
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圖書
1.	Coles, S. G.(2001)。An Introduction to Statistical Modeling of Extreme Values。London：Springer-Verlag。

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1.	De Haan, L.、Jansen, D. W.、Koedijk, K.、De Vries, C. G.(1994)。Safety First Portfolio Seletion, Extreme Value Theory and Long Run Asset Risks。Extreme Value Theory and Applications。Boston：Kluwer Acadeic。

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