Pricing Mortgage-Backed Security: An Empirical Analysis

Ji-chang Dong, Ji-xue Liu, Cheng-hao Wang, Hong Yuan, Wen-jun Wang
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引用次数: 5

Abstract

This article summarizes the factors and basic theory in mortgaged-backed securities pricing, builds suitable models for Chinese MBS product, and carries out empirical study on Jianyuan 2007-1RMBS. By assimilating the successful experiences of developed countries and regions, BDT model is applied to construct term structure of 1-year interest rate, and then under the assumption that CPR is 100% PSA, binary tree of interest rate path is generated through Monte-Carlo simulation, and finally, the option-adjusted spread (OAS) values of three tranches are calculated. The conclusion is that when OAS is low, the nominal spread equals to or slightly higher than OAS, while the difference will gradually expand with the OAS increasing. Moreover, the OAS pricing method more adapts to market-oriented interest rates, and can be used as reference in Chinese MBS pricing in the future.

抵押贷款支持证券定价:实证分析
本文总结了抵押贷款支持证券定价的影响因素和基本理论,构建了适合我国抵押贷款支持证券产品的定价模型,并对建源2007-1RMBS进行了实证研究。通过吸收发达国家和地区的成功经验,运用BDT模型构建1年期利率期限结构,然后在假设CPR为100% PSA的情况下,通过蒙特卡罗模拟生成利率路径二叉树,最后计算出三个等级的期权调整价差(OAS)值。结论是,当OAS较低时,名义价差等于或略高于OAS,而差异会随着OAS的增加而逐渐扩大。此外,OAS定价方法更适应市场化利率,可为未来我国MBS定价提供借鉴。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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