Consider a credit rating system consisting of three credit states, A, B and D (default) with the following annual credit transition probability: T = [0.7 0.2 0.1;0.2 0.5 0.3; 0 0 1].

For a company rated B, calculate: a) The credit spread, calculated semi-annually, ten years into the future.

The semi-annually is throwing me off. I know that credit spread = - ln q where q is the solvency. For ten years into the future, we simply take T^10 and the solvency is just 1-default. But they want the credit spread calculated semiannually, ten years into the future.

Edit: I'm wondering if it's asking two different questions ie. calculate credit spread semiannually (T^1/2) and ten years into the future (T^10), or is there a way to calculate the semi annual rate ten years into the future?

  • 2
    $\begingroup$ Related $\endgroup$ Mar 27, 2014 at 16:24
  • $\begingroup$ You need a matrix whose square is the annual matrix. The question is covered at quant.stackexchange.com/questions/10645/… $\endgroup$
    – Brian B
    Mar 30, 2014 at 22:44
  • $\begingroup$ Awesome thank you. I finished the question, I'm just wondering now about the yield rate. Id use 1%/2 for the semiannual coupons, yes? $\endgroup$
    – Marie
    Apr 1, 2014 at 1:05


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