It sounds like you want to stack another probability on top of a probability.  The net gives you an estimate of P(C|x) and then you want a probabilistic measure of how accurate an estimate that is.  This starts to get a little difficult for me to think about.  It seems like you might be able to estimate it by running the net on a test set (disjoint of course from the training set) and applying standard statistical methods to the results, just like you could for any experiment.<p>EDIT: Maybe it&#x27;s more complicated than that though because the experiment is itself estimating a probability, not just the value of some random variable.  Maybe we need a real statistics expert to look into this.