https://communities.sas.com/t5/SAS-Procedures/compare-differeces-of-proportions-in-pre-post-test/m-p/23434#M5192 The pre-test contains only one question; the post-test contains the same question.<BR /> Group1 has 130 subjects; group2 has 135 subjects.<BR /> In the pre-test, 43% of group1 passed (answered the question correctly); 45% of group2 passed.<BR /> In the post-test, 52% of group1 passed; 61% of group2 passed.<BR /> <BR /> How do I compare the proportion changes between the two groups? Both proc freq and proc anova seem not proper.<BR /> <BR /> Thanks. Thu, 05 Jun 2008 15:27:23 GMT runsun 2008-06-05T15:27:23Z https://communities.sas.com/t5/SAS-Procedures/compare-differeces-of-proportions-in-pre-post-test/m-p/23434#M5192 The pre-test contains only one question; the post-test contains the same question.<BR /> Group1 has 130 subjects; group2 has 135 subjects.<BR /> In the pre-test, 43% of group1 passed (answered the question correctly); 45% of group2 passed.<BR /> In the post-test, 52% of group1 passed; 61% of group2 passed.<BR /> <BR /> How do I compare the proportion changes between the two groups? Both proc freq and proc anova seem not proper.<BR /> <BR /> Thanks. Thu, 05 Jun 2008 15:27:23 GMT https://communities.sas.com/t5/SAS-Procedures/compare-differeces-of-proportions-in-pre-post-test/m-p/23434#M5192 runsun 2008-06-05T15:27:23Z https://communities.sas.com/t5/SAS-Procedures/compare-differeces-of-proportions-in-pre-post-test/m-p/23435#M5193 You could use CATMOD and related procedures. Fri, 20 Jun 2008 15:40:32 GMT https://communities.sas.com/t5/SAS-Procedures/compare-differeces-of-proportions-in-pre-post-test/m-p/23435#M5193 deleted_user 2008-06-20T15:40:32Z