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iwright218
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Joined: November 3rd, 2008, 1:49 pm

Probability

December 5th, 2008, 9:59 am

If the conditional probability for 12 firms to defaults is 3% for all firms out to 5 years; does anyone know how to calculate the cumulative probability for all firms out to 5 years?ThanksI
 
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villiger
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Joined: July 14th, 2002, 3:00 am

Probability

December 6th, 2008, 9:50 am

This depends on the correlation, or better the joint probability distribution. You haven't mentioned any assumption regarding to this. Typically they might be correlated with each other. You can model that nicely with copulas. But you need to define the dependence structure, ie which copula, and then you also need to estimate the parameters typical for the copula.
 
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Joined: October 26th, 2005, 2:08 pm

Probability

December 6th, 2008, 1:54 pm

Conditional probability with respect to?