https://communities.sas.com/t5/Statistical-Procedures/Logistic-regression-concordant-percentage/m-p/292832#M15572 <P>Only if your data has perfect separation. Usually this happens when you accidentally include a variable that's observed with the outcome, sometimes after the fact.&nbsp;</P> <P>&nbsp;</P> <P>I wouldn't trust the model and would be verifying it thoroughly.&nbsp;</P> <P>&nbsp;</P> <P>PS I'm going to move this to the stats forums as it relates more to statistics.&nbsp;</P> Fri, 19 Aug 2016 19:53:20 GMT Reeza 2016-08-19T19:53:20Z https://communities.sas.com/t5/Statistical-Procedures/Logistic-regression-concordant-percentage/m-p/292809#M15571 <P>Hi,</P><P>I'm sas new user. I wonder if it's possible to get a 100% concordant percentage and D de Somers value=1 with a logistic regression. It seems so perfect to me!</P><P>Thanks</P> Fri, 19 Aug 2016 18:45:34 GMT https://communities.sas.com/t5/Statistical-Procedures/Logistic-regression-concordant-percentage/m-p/292809#M15571 freedom93 2016-08-19T18:45:34Z https://communities.sas.com/t5/Statistical-Procedures/Logistic-regression-concordant-percentage/m-p/292832#M15572 <P>Only if your data has perfect separation. Usually this happens when you accidentally include a variable that's observed with the outcome, sometimes after the fact.&nbsp;</P> <P>&nbsp;</P> <P>I wouldn't trust the model and would be verifying it thoroughly.&nbsp;</P> <P>&nbsp;</P> <P>PS I'm going to move this to the stats forums as it relates more to statistics.&nbsp;</P> Fri, 19 Aug 2016 19:53:20 GMT https://communities.sas.com/t5/Statistical-Procedures/Logistic-regression-concordant-percentage/m-p/292832#M15572 Reeza 2016-08-19T19:53:20Z