English, Article edition: A HYBRID-FORM MODEL FOR THE PREPAYMENT-RISK-NEUTRAL VALUATION OF MORTGAGE-BACKED SECURITIES ANDREAS KOLBE; RUDI ZAGST

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Bookmark: http://trove.nla.gov.au/version/82867
Physical Description
  • article
Language
  • English

Edition details

Title
  • A HYBRID-FORM MODEL FOR THE PREPAYMENT-RISK-NEUTRAL VALUATION OF MORTGAGE-BACKED SECURITIES
Author
  • ANDREAS KOLBE
  • RUDI ZAGST
Physical Description
  • article
Notes
  • In this paper we present a prepayment-risk-neutral valuation model for fixed-rate Mortgage-Backed Securities. Our model is based on intensity models as used in credit-risk modeling and extends existing models for individual mortgage contracts in a proportional hazard framework. The general economic environment is explicitly accounted for in the prepayment process by an additional factor which we fit to the quarterly GDP growth rate in the US. In our risk-neutral setting we account for both the fears of refinancing understatement and turnover overstatement which sometimes result in higher option-adjusted spreads (OAS) for premiums and discounts respectively. We apply our prepayment-risk-neutral pricing approach to a sample of generic 30yr GNMA MBS pass-throughs from 1996 to 2006. Our empirical results indicate that the GDP growth factor adds explanatory power to the model.
  • Prepayment, Mortgage-Backed Security, OAS, intensity, risk-neutral pricing, proportional hazard
  • RePEc:wsi:ijtafx:v:11:y:2008:i:06:p:635-656
Language
  • English
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