PROC TTEST for Comparing Two Groups

Introduction to Analysis-of-Variance Procedures

PROC TTEST for Comparing Two Groups

If you want to perform an analysis of variance and have only one classification variable with two levels, you can use PROC TTEST. In this special case, the results generated by PROC TTEST are equivalent to the results generated by PROC ANOVA or PROC GLM. In addition to testing for differences between two groups, PROC TTEST performs a test for unequal variances. You can use PROC TTEST with balanced or unbalanced groups. The PROC NPAR1WAY procedure performs nonparametric analogues to t tests. See Chapter 13, "Introduction to Nonparametric Analysis," for an overview and Chapter 47 for details on PROC NPAR1WAY.

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