https://communities.sas.com/t5/Statistical-Procedures/How-to-interpret-the-CV-in-PROC-TTEST-when-the-Equality-of/m-p/226132#M11965 <P>I would ignore the reported CV in this case.</P><P>&nbsp;</P><P>If you really need a CV-like statistic in this case, compute it using the mean and variance of each group.</P> Thu, 17 Sep 2015 20:14:25 GMT PaigeMiller 2015-09-17T20:14:25Z https://communities.sas.com/t5/Statistical-Procedures/How-to-interpret-the-CV-in-PROC-TTEST-when-the-Equality-of/m-p/226000#M11958 <P>Dear Supporters,</P> <P>&nbsp;</P> <P>I ran a PROC TTEST for comparison of two groups, from the Equality of Variance test the <EM>p-value</EM> is far less then the 0.05, hence, we can say these two samples are heterogeneous of variance, in this case, why the CV is not calculated by Satterthwaite method, but still by the pooled method ? How to interprest such CV? Thanks.</P> <P>The data is lognormal distributed.</P><BR /><IMG src="https://communities.sas.com/t5/image/serverpage/image-id/11959iDDF429D5A0F599DE/image-size/large?v=1.0&amp;px=600" border="0" alt="TTest question.jpg" title="TTest question.jpg" /> Thu, 17 Sep 2015 08:59:04 GMT https://communities.sas.com/t5/Statistical-Procedures/How-to-interpret-the-CV-in-PROC-TTEST-when-the-Equality-of/m-p/226000#M11958 Jack2012 2015-09-17T08:59:04Z https://communities.sas.com/t5/Statistical-Procedures/How-to-interpret-the-CV-in-PROC-TTEST-when-the-Equality-of/m-p/226132#M11965 <P>I would ignore the reported CV in this case.</P><P>&nbsp;</P><P>If you really need a CV-like statistic in this case, compute it using the mean and variance of each group.</P> Thu, 17 Sep 2015 20:14:25 GMT https://communities.sas.com/t5/Statistical-Procedures/How-to-interpret-the-CV-in-PROC-TTEST-when-the-Equality-of/m-p/226132#M11965 PaigeMiller 2015-09-17T20:14:25Z