Dear Reeza, Thank you very much!! Following what you suggested, I find this at support. sas: https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_logistic_sect066.htm I think by using outmodle and then inmodel, I can use the old model to fit the new data. But, the 'fitstat' option doesn't gave me the c-statistic I need. Do I have to calculate it manunaly? What I did before is, store the estimated coefficients of the model estimated by old sampe, assign it as the initial value of the new data, and set convergence criterion to huge number. By doing this will i get what i want? Cause this way i can get the c-statistic. I attached the code below. Thanks again!! Best wishes. ods output Association=C_boot; proc logistic data=boot descending out=boot_est; model pass=age gender height; run; proc transpose data=C_boot (keep=nValue2) out=C_boot(keep=col4); run; ods output Association=C_test; proc logistic data=newdata descending INEST=boot_est; model pass=age gender height/GCONV=100000; run;
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