March 13th, 2002, 12:16 pm
The only way to evaluate the hypothesis that an 'optimized' merton model is a sufficient predictor of default is data, which isn't easy for most people to get. Note, however, that of over 1400 publicly traded defaulting firms in the post-1980 US data, KMV strangely used only 141 of these in their demonstration that EDFs weren't helped by other variables. This won't be he said/she said for long; take the data yourself, crosstab with your favorite ratio, and look at future performance--nature is indifferent to who wins. In any case, I'm sure Moody's/KMV will simply hope that both he Moody's public model and KMV private model quietly fade away.