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| Title: | 單因子關聯結構模型與時間數列模型應用於合成型擔保債權憑證之評價
The One-factor Copula Model and the Time Series Model for Synthetic CDO Pricing |
| Authors: | 劉釋璟
Liu, Shih Ching |
| Contributors: | 劉惠美
陳麗霞
劉釋璟
Liu, Shih Ching |
| Keywords: | 合成型擔保債權憑證
單因子關聯結構模型
單因子NIG關聯結構模型
AR(1)
synthetic CDO
one-factor copula model
one-factor NIG copula model
AR(1) |
| Date: | 2015 |
| Issue Date: | 2015-07-27 11:21:55 (UTC+8) |
| Abstract: | Lamb、Perraudin和 Landschoot (2009)提出市場共同因子具有時間數列特性AR(p)的單因子關聯結構模型，評價合成型擔保債權憑證，其最佳模型為市場共同因子具備AR(1)，且使用兩個高斯分配組合之混合分配，結果顯示除了權益分券外，其他分券均有不錯的配適結果。本文僅討論市場共同因子具備AR(1)之高斯關聯結構模型，針對CDX.NA.IG.指數Series 9 五年期之週資料，以極小化各分券總絕對誤差，來比較不同評價模型的估計結果，分成三組進行，分別為(1)單因子高斯關聯結構模型(期數固定)v.s.單因子NIG關聯結構模型(期數固定)(2)單因子高斯關聯結構模型(期數遞減)v.s.單因子NIG關聯結構模型(期數遞減)(3)單因子高斯關聯結構模型(期數固定)v.s.單因子NIG關聯結構模型(期數固定)v.s.市場共同因子具備AR(1)之高斯關聯結構模型。觀察市場共同因子具備AR(1)之高斯關聯結構模型中的每週參數，可以發現相關係數長期來看呈現穩定，約介於0.7至0.9之間，與Lamb等(2009)觀察到的現象一致，表示造成各分券市場報價波動的主要原因並非相關係數的波動，而與市場共同因子前一期的水準有關。
Lamb, Perraudin, Landschoot (2009) proposed the one-factor copula model with the common factor under the assumption of AR(p) for pricing synthetic CDO. Their best model was the mixture model with AR(1). Additionally, there were good fits on different tranches, except the equity tranch. This paper applies the one-factor Gaussian copula model with the common factor under the assumption of AR(1) to the pricing of CDX.NA.IG. Series 9 weekly data (5-year maturity). We minimize the total absolute error on different tranches to obtain the parameters of different models. We compare three sets of models: (1) The one-factor Gaussian copula model (fixed maturity) v.s. the one-factor NIG copula model (fixed maturity). (2) The one-factor Gaussian copula model (declined maturity) v.s. the one-factor NIG copula model (declined maturity). (3) The one-factor Gaussian copula model (fixed maturity) v.s. the one-factor NIG copula model (fixed maturity) v.s. the one-factor Gaussian copula model with the common factor under the assumption of AR(1). In the one-factor Gaussian copula model with the common factor under the assumption of AR(1), we find the correlation parameter is stable through the observed period, ranging from 0.7 to 0.9. The same fact was observed in Lamb et al.,2009. This means that the market spreads are driven considerably by the level of one factor lag, not the default correlations. |
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林聖航「探討合成型抵押擔保債券憑證之評價」。國立政治大學統計學系碩士論文。(民101) |
| Description: | 碩士
國立政治大學
統計研究所
102354014 |
| Source URI: | http://thesis.lib.nccu.edu.tw/record/#G0102354014 |
| Data Type: | thesis |
| Appears in Collections: | [統計學系] 學位論文
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