APPENDIX TO CHAPTER 14Corporate Debt and Credit Default Swaps

A14.1 CUMULATIVE DEFAULT AND SURVIVAL RATES

Proposition: If the hazard rate is constant at normal lamda, then the cumulative survival probability to time t, upper C upper S left-parenthesis t right-parenthesis, is e Superscript minus normal lamda t, and the cumulative default probability, upper C upper D left-parenthesis t right-parenthesis, is 1 minus e Superscript minus normal lamda t.

Proof: The probability of no default to time t plus normal upper Delta t, upper C upper S left-parenthesis t plus normal upper Delta t right-parenthesis, is the probability that there is no default to time t and no default from then to time t plus normal upper Delta t. Mathematically,

(A14.1)

Taking the limit of the right‐hand side of (A14.2) as approaches zero ...

Get Fixed Income Securities, 4th Edition now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.