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Posted 12-16-2015 04:27 PM
(2465 views)
I am trying to compare means of two groups. The sample size for each group is small (between 9 and 15) and the sample size for each group is not the same. 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. I have also been using proc npar1way and looking at the Wilcoxon results, which I think weights by sample size as the default. Am I on the right track? Any advice is appreciated. Thanks.
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With samples that small I personally would lean heavily on the nonparametric approaches.
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Besides non-parametric, I would also be relying heavily on knowledge of the data and make sure to include confidence intervals.