Chapter 12 Nonparametric Tests
Performing a Wilcoxon Rank-Sum Test
Performing a Wilcoxon Signed-Rank Test (for Paired Data)
Performing a Kruskal-Wallis One-Way ANOVA
Comparing Spread: The Ansari-Bradley Test
Converting Data Values into Ranks
Using PROC RANK to Group Your Data Values
Introduction
SAS provides several nonparametric tests, such as the Wilcoxon rank-sum test, the Wilcoxon signed-rank test, and a Kruskal-Wallis analysis of variance. This chapter describes these tests, as well as a way to convert your data values to ranks, so that you can then run parametric tests on the ranked data.
Performing a Wilcoxon Rank-Sum Test
As an example, suppose you want to test whether incomes in the Salary data set are equal ...
