https://communities.sas.com/t5/Statistical-Procedures/TTest-with-small-unequal-sample-size/m-p/239640#M12686 Besides non-parametric, I would also be relying heavily on knowledge of the data and make sure to include confidence intervals. Wed, 16 Dec 2015 22:35:42 GMT Reeza 2015-12-16T22:35:42Z https://communities.sas.com/t5/Statistical-Procedures/TTest-with-small-unequal-sample-size/m-p/239626#M12684 <P>I am trying to compare means of two groups. &nbsp;The sample size for each group is small (between 9 and 15) and the sample size for each group is not the same. &nbsp;I have been using proc ttest and looking at the satterthwaite correction p value. The variances are equal (normality is a little off), but I read somewhere that satterthwaite corrects for both variance issues as well as unequal sample sizes.&nbsp;I have also been using proc npar1way and looking at the Wilcoxon results, which I think weights by sample size as the default. &nbsp;Am I on the right track? &nbsp;Any advice is appreciated. &nbsp;Thanks.&nbsp;</P> Wed, 16 Dec 2015 21:27:26 GMT https://communities.sas.com/t5/Statistical-Procedures/TTest-with-small-unequal-sample-size/m-p/239626#M12684 nodak 2015-12-16T21:27:26Z https://communities.sas.com/t5/Statistical-Procedures/TTest-with-small-unequal-sample-size/m-p/239634#M12685 <P>With samples that small I personally would lean heavily on the nonparametric approaches.</P> Wed, 16 Dec 2015 22:28:17 GMT https://communities.sas.com/t5/Statistical-Procedures/TTest-with-small-unequal-sample-size/m-p/239634#M12685 ballardw 2015-12-16T22:28:17Z https://communities.sas.com/t5/Statistical-Procedures/TTest-with-small-unequal-sample-size/m-p/239640#M12686 Besides non-parametric, I would also be relying heavily on knowledge of the data and make sure to include confidence intervals. Wed, 16 Dec 2015 22:35:42 GMT https://communities.sas.com/t5/Statistical-Procedures/TTest-with-small-unequal-sample-size/m-p/239640#M12686 Reeza 2015-12-16T22:35:42Z