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價格跳躍與避險策略之探討-以道瓊工業指數現貨與期貨為例

Jump Diffusion and Optimal Hedging Strategy - An Application of Dow Jones Index and Futures

摘要


本文以美國股票市場為研究對象,利用道瓊工業平均指數期貨來規避其指數現貨波動之風險。相關資料取自Bloomberg資料庫,資料型態為日資料,取樣期間為1998年1月2日到2003年7月25日,樣本數共1399筆。在追求風險極小化之前提下,本文試圖利用GARJI模型來捕捉市場因突發性重大經濟事件所造成資產報酬率之隨機跳躍不連續現象,利用移動視窗,以道瓊工業股價指數為研究對象,探討樣本外之避險績效,同時應用OLS模型、GARJI模型及GARCH模型進行避險績效及短天期和長天期之避險績效差異性分析。實證結果發現以GARJI模型進行避險的績效未若預期中理想。但不論採用何種避險模型進行現貨部位之避險,皆能大幅地降低持有現貨之風險,實證顯示股價指數期貨契約為一良好的避險工具。

關鍵字

GARJI GARCH 樣本外避險 移動視窗

並列摘要


This study investigates the optimal hedge strategies between Dow Jones index futures and its spot market by using OLS, GARJI, and GARCH models. The daily data are collected from Bloomberg Data Base; there are 1399 observations from Jan. 2, 1998 to July 25, 2003. Under the assumption of minimizing the risk, we use GARJI to capture the price jumps phenomena that result from the impact of sudden economic changes upon asset returns. Rolling windows are adopted and the out of sample hedging performance with different hedging horizons are compared among OLS, GARJI, and GARCH models. Despite the results of GARJI do not standout as we expected, the underlying hedging models in futures can indeed reduce the spot's holding risks. Empirically evidence shows the stock index future is a good hedging utility.

並列關鍵字

GARJI GARCH Out of Sample Hedging Rolling Window

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