# Which probabilites are to be supplied to rcorr.cens and improveProb in package Hmisc?

Both functions are great for comparing, for example, survival models. The first especially for computing Harrell's C-index, the second for NRI and IDI.

However, it looks like rcorr.cens takes survival probabilities and improveProb takes event probabilites, that is, 1 - survival probabilities, as arguments. Could somebody confirm this? It just feels weird, and I haven't been able to find information on it in the documentation.

-