Does anyone know of a method to compare Harrel's
c-statistics for censored data?  I guess a
modification of the wilcoxon rank-sum test might work,
however, does anyone have more detail?  Thanks.
For what it's worth, I know of a method for defining confidence intervals 
for the difference between 2 Harrell C statistics, based on the jackknife, 
but I haven't had time to implement it in Stata. However, a quick and dirty 
solution might possibly be to use the jackknife using -jknife- in official 
Stata, together with Bill Gould's -stcstat- command (type -findit harrell 
c- to find out more).