Performing a Wilcoxon signed-rank test of the median difference between two numeric columns
A Wilcoxon signed-rank test indicates whether the median difference between two numeric columns appears to differ from zero. It is similar to a paired t-test in that it can be used to analyze related observations (for example, "before" and "after" data). Unlike a paired t-test, the Wilcoxon signed-rank test makes no assumptions about the underlying distribution of values.
To perform a Wilcoxon signed-rank test:
- In the Summary view, use the confidence slider to choose a desired confidence level
- Command-click two numeric columns of interest on the left
- Check the box labeled "Repeated measures" below the summary picture
- Select the button below the Covariate view labeled "Boxes"
- The result of the Wilcoxon signed-rank test will appear in the Bottom Line
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