How do I output the c-statistic with proc logistic when the strata statement is used? Without the strata statement, this statistic is output automatically. Google searches indicate many of the options for outputting data related to the c-statistic in proc logistic do not apply when the strata statement is used, and I'm looking for a workaround. I'm using SAS 9.4. ... View more

Do I need to suppress the intercept in proc surveylogistic when using the strata statement to avoid the dummy variable trap (SAS 9.4)? I see that when I use the strata statement with proc logistic, the model automatically suppresses the intercept.  When I use the strata statement with proc surveylogistic, the intercept is not suppressed, and I get very different coefficient estimates on other variables of interest.  Why do proc logistic and proc surveylogistic handle the intercept differently under the Strata statement? ... View more