https://communities.sas.com/t5/Statistical-Procedures/How-to-get-95-confidence-interval-for-Harrell-s-C-statistic-PROC/m-p/878580#M43442 Yes. Since the delta method is used to obtain the standard error, it is assumed that the statistic is asymptotically normal. Wed, 31 May 2023 21:58:52 GMT StatDave 2023-05-31T21:58:52Z https://communities.sas.com/t5/Statistical-Procedures/How-to-get-95-confidence-interval-for-Harrell-s-C-statistic-PROC/m-p/878546#M43440 <P>I see that you can use the CONCORDANCE option with PROC PHREG to compute Harrell's Concordance Statistic, but I can't seem to figure out a way to have 95% confidence limits included in the output. Would I have to use CONCORDANCE=HARRELL(SE), and then calculate the 95% CI as Estimate +/- 1.96*(Standard Error) ?</P> Wed, 31 May 2023 19:14:02 GMT https://communities.sas.com/t5/Statistical-Procedures/How-to-get-95-confidence-interval-for-Harrell-s-C-statistic-PROC/m-p/878546#M43440 derekg 2023-05-31T19:14:02Z https://communities.sas.com/t5/Statistical-Procedures/How-to-get-95-confidence-interval-for-Harrell-s-C-statistic-PROC/m-p/878580#M43442 Yes. Since the delta method is used to obtain the standard error, it is assumed that the statistic is asymptotically normal. Wed, 31 May 2023 21:58:52 GMT https://communities.sas.com/t5/Statistical-Procedures/How-to-get-95-confidence-interval-for-Harrell-s-C-statistic-PROC/m-p/878580#M43442 StatDave 2023-05-31T21:58:52Z