topic ttest proc with weight option in SAS Procedures https://communities.sas.com/t5/SAS-Procedures/ttest-proc-with-weight-option/m-p/87584#M24992 <HTML><HEAD></HEAD><BODY><P style="text-align: left;">Hello everyone,</P><P style="text-align: left;">I tried to use the <EM>ttest </EM>procedure while using the <EM>WEIGHT </EM>option. In the output I got, there was only t-test for the 'equal variances' case.</P><P style="text-align: left;">When I tried to use the COCHRAN option to get the t-test for unequal variances I got a warning message: 'WARNING: The COCHRAN option is ignored when using WEIGHT statement'. </P><P style="text-align: left;">I should note that when I don't weight the cases I receive all of the relevant t-test: t-test for equal variances (pooled), t-test for unequal variances (Satterthwaite) and t-test for unequal variances (Cochran).</P><P style="text-align: left;">Is anyone familiar with this problem?</P><P style="text-align: left;">How can I weight my cases but still get the unequal variances t-test in the output (as some of the Levin tests indicate that I should reject the equal variances null assumption).</P><P style="text-align: left;">Thanks!</P></BODY></HTML> Wed, 18 Apr 2012 12:09:28 GMT avital 2012-04-18T12:09:28Z ttest proc with weight option https://communities.sas.com/t5/SAS-Procedures/ttest-proc-with-weight-option/m-p/87584#M24992 <HTML><HEAD></HEAD><BODY><P style="text-align: left;">Hello everyone,</P><P style="text-align: left;">I tried to use the <EM>ttest </EM>procedure while using the <EM>WEIGHT </EM>option. In the output I got, there was only t-test for the 'equal variances' case.</P><P style="text-align: left;">When I tried to use the COCHRAN option to get the t-test for unequal variances I got a warning message: 'WARNING: The COCHRAN option is ignored when using WEIGHT statement'. </P><P style="text-align: left;">I should note that when I don't weight the cases I receive all of the relevant t-test: t-test for equal variances (pooled), t-test for unequal variances (Satterthwaite) and t-test for unequal variances (Cochran).</P><P style="text-align: left;">Is anyone familiar with this problem?</P><P style="text-align: left;">How can I weight my cases but still get the unequal variances t-test in the output (as some of the Levin tests indicate that I should reject the equal variances null assumption).</P><P style="text-align: left;">Thanks!</P></BODY></HTML> Wed, 18 Apr 2012 12:09:28 GMT https://communities.sas.com/t5/SAS-Procedures/ttest-proc-with-weight-option/m-p/87584#M24992 avital 2012-04-18T12:09:28Z Re: ttest proc with weight option https://communities.sas.com/t5/SAS-Procedures/ttest-proc-with-weight-option/m-p/87585#M24993 <HTML><HEAD></HEAD><BODY><P>Did you try to use FREQ statement?</P><P>I think the best way is to talk with Technical Support .</P><P>From your log , It seems that you can get the t-test for unequal variances.</P><P></P><P></P><P>Ksharp</P></BODY></HTML> Thu, 19 Apr 2012 02:43:02 GMT https://communities.sas.com/t5/SAS-Procedures/ttest-proc-with-weight-option/m-p/87585#M24993 Ksharp 2012-04-19T02:43:02Z