| 研究生: |
黃于騰 Huang, Yu Teng |
|---|---|
| 論文名稱: |
探討標準化偏斜Student-t分配關聯結構模型之抵押債務債券之評價 Pricing CDOs with Standardized Skew Student-t Distribution Copula Model |
| 指導教授: |
劉惠美
Liu, Hui Mei |
| 學位類別: |
碩士
Master |
| 系所名稱: |
商學院 - 統計學系 Department of Statistics |
| 論文出版年: | 2013 |
| 畢業學年度: | 101 |
| 語文別: | 中文 |
| 論文頁數: | 30 |
| 中文關鍵詞: | 抵押債務債券 、單因子關聯結構模型 、標準化偏斜Student-t分配 |
| 外文關鍵詞: | collateralized debt obligation, one factor copula model, standardized skew student-t distribution |
| 相關次數: | 點閱:166 下載:0 |
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在市場上最常被用來評價抵押債務債券(Collateralized Debt Obligation, CDO)的分析方法即為應用大樣本同質性資產組合(Large Homogeneous Portfolio, LHP)假設之單因子關聯結構模型(One Factor Copula Model)。由過去文獻指出,自2008年起,抵押債務債券的商品結構已漸漸出現改變,而目前所延伸之各種單因子關聯結構模型在新型商品的評價結果中皆仍有改善空間。
在本文中使用標準化偏斜Student-t分配(Standardized Skew Student-t distribution, SSTD)取代傳統的高斯分配進行抵押債務債券之分券的評價,此分配擁有控制分配偏態與峰態的參數。但是與Student-t分配相同,SSTD同樣不具備穩定的摺積(convolution)性質,因此在評價過程中會額外消耗部分時間。而在實證分析中,以單因子SSTD關聯結構模型評價擔保債務債券新型商品之分券時得到了較佳的結果,並且比單因子高斯關聯結構模型擁有更多參數以符合實際需求。
The most widely used method for pricing collateralized debt obligation(CDO) is the one factor copula model with Large Homogeneous Portfolio assumption. Based on the literature of discussing, the structure of CDO had been changed gradually since 2008. The effects for pricing new type CDO tranches in the current extended one factor copula models are still improvable.
In this article, we substitute the Gaussian distribution with the Standardized Skew Student-t distribution(SSTD) for pricing CDO tranches, and it has the features of heavy-tail and skewness. However, similar to the Student-t distribution, the SSTD is not stable under convolution as well. For this reason, it takes extra time in the pricing process. The empirical analysis shows that the one factor SSTD copula model has a good effect for pricing new type CDO tranches, and furthermore it brings more flexibility to the one factor Gaussian copula model.
目錄
摘要 I
Abstract II
表目錄 IV
圖目錄 IV
第一章 緒論 1
第一節 研究背景與動機 1
第二節 研究目的 2
第三節 信用違約交換(Credit Default Swap, CDS) 2
第四節 抵押債務債券(Collateralized Debt Obligation, CDO) 3
第五節 合成型抵押債務債券(Synthetic CDOs) 4
第六節 信用違約交換指數(Credit Default Swap Index) 5
第七節 本文架構 6
第二章 文獻回顧 7
第一節 關聯結構模型(Copula Model) 7
第二節 單因子關聯結構模型(One Factor Copula Model) 8
第三節 Standardized Skew Student-t Distribution(SSTD) 9
第三章 評價方法與應用LHP之單因子SSTD關聯結構模型 11
第一節 合成型CDO的評價方法 11
第二節 應用LHP之單因子高斯關聯結構模型 14
第三節 SSTD定義與性質 15
第四節 應用LHP之單因子SSTD關聯結構模型 17
第四章 實證分析:評價DJ iTraxx信用違約交換指數 23
第一節 評價商品介紹 23
第二節 DJ iTraxx之分券評價結果 25
第五章 結論與建議 28
參考文獻 29
表目錄
表 4 1 DJ iTraxx Europe Series 9與DJ iTraxx Europe Series 15的市場報價 24
表 4 2 DJ iTraxx Europe Series 9之市場報價與配適結果 25
表 4-3 林聖航(2012)於DJ iTraxx Europe Series 9不同模型之評價結果 25
表 4 4 DJ iTraxx Europe Series 15之市場報價與配適結果 26
表 4-5林聖航(2012)於DJ iTraxx Europe Series 15不同模型之評價結果 26
圖目錄
圖 1 1 CDO流程架構 2
圖 1 2合成型CDO流程架構 3
圖 3 1參數v與參數ξ對SSTD機率密度函數之影響 15
圖 3 2固定ρi下其他參數對Ω分配機率密度函數之影響 17
圖 3 3固定各參數之下改變ρi對Ω分配機率密度函數之影響 18
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