淡江大學機構典藏:Item 987654321/51924
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 64178/96951 (66%)
造访人次 : 9304572      在线人数 : 203
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧：
  • 您可在西文检索词汇前后加上"双引号"，以获取较精准的检索结果
  • 若欲以作者姓名搜寻，建议至进阶搜寻限定作者字段，可获得较完整数据
    •  进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/51924


    题名: 持有新臺幣的VaR尾部風險之回顧測試
    其它题名: Backtesting the tail risk of VaR in holding new Taiwan dollar
    作者: 黃詩紋;Huang, Shih-wun
    贡献者: 淡江大學管理科學研究所碩士班
    莊忠柱;Chuang, Chung-chu
    关键词: 風險值;GARCH;APARCH;回顧測試;Value-at-Risk;GARCH;APARCH;Backtesting
    日期: 2010
    上传时间: 2010-09-23 16:16:16 (UTC+8)
    摘要: 本研究以主要工業國（美元、歐元、日圓、加拿大幣與英鎊）對新台幣每日匯率收盤價為研究對象，利用GARCH與APARCH模型在常態分配、t分配與偏態t分配的假設下，進行90%、95%、99%及99.5%信賴水準的多空頭部位風險值之估計。最後將所有風險值模型進行其績效衡量，並利用Kupiec（1995）的概似比檢定(Likelihood Ratio Test)對風險值模型進行比較，找出計算風險值較佳模型。研究結果發現：
    1. 就多頭部位而言，GARCH-n模型在低顯著水準(10%及5%顯著水準)下的風險值績效有不錯的表現，但GARCH-n模型在高顯著水準(1%及0.5%顯著水準)下的風險值績效卻未能通過回顧測試，表示常態分配無法確切地捕捉厚尾的性質。t分配與偏態t分配皆能改善在尾部分佈下的風險值績效，並能緩和常態分配無法確切地捕捉厚尾的問題。然而，偏態t分配相對於t分配的尾端分佈風險值績效的改善程度卻有限。

    2. 就空頭部位而言，普遍在常態分配下的GARCH與APARCH模型的風險值績效有較佳的表現。普遍在t分配下的GARCH與APARCH模型的風險值績效表現較不佳，因估算出的實際穿透個數往往低於理論穿透個數甚多，導致無法通過回顧測試的檢定，表示t分配假設潛在引發風險值估計過於保守的缺失。普遍在偏態t分配下的GARCH與APARCH模型可改善t分配假設潛在引發風險值估計過於保守的缺失。
    The study is to compute VaR in the long and short trading position by using GARCH and APARCH models with normal distribution, student t distribution and skewed student t distribution at four significant levels. The sample daily data covers New Taiwan Dollar to US Dollar, European Euros, Japanese Yen, Canadian Dollar and British Pound exchange rate. Moreover, the study is to evaluate the validity of different models by using backtesting method based on likelihood ratio test proposed by Kupiec (1995). The empirical results are as follows:

    1. For the long trading positions, the GARCH model with normal distribution has poor validity in high significant levels due to the fat-tail problem. The fat-tail problem could be improved by the student t distribution and skewed student t distribution. However, compared with student t distribution the improved VaR performance of the skewed t distribution is not significant.
    2. For the short trading positions, the GARCH and APARCH models with normal distribution has good validity. The GARCH and APARCH models with student t distribution induced the over-conservative problem of VaR estimation, but the GARCH and APARCH models with skewed t distribution could improved it.
    显示于类别:[管理科學學系暨研究所] 學位論文

    文件中的档案:

    档案 大小格式浏览次数
    index.html0KbHTML229检视/开启

    在機構典藏中所有的数据项都受到原著作权保护.

    TAIR相关文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回馈