Hi everyone,   I am new to SAS. I am trying to compute an optimism-corrected c statistic using the following code:    proc surveyselect data= mydata seed=12345 out =samples method= urs samprate=1 outhits reps=1000; run   proc logistic data=samples; by replicate; model outcome= a b c d e; ods output parameterestimates= out association= assoc; run;    The result is a table of coefficients generated for each variable in each replicate (dataset out) and a table of concordance indices (dataset assoc).    How can I compute the optimism-corrected c statistic? Is there an efficient way to apply each replicate's coefficients to my original dataset to generate a C statistic and then subtract all of the bootstrapped c statistics from the original c statistic?    Thank you very much for your help.  ... View more