UPCOMING WEBINAR: From Chat to Agents: The New Phase of AI in Market Research This article describes how to perform the Wilcoxon signed-rank test for comparing the medians of a pair of samples.
For samples of different sizes, see How to Perform Two-Sample Wilcoxon Rank Sum Test.
Requirements
A Displayr document with a data set.
Method
- From the Report tree select +> Advanced Analysis > Test > Nonparametric > Paired Samples Wilcoxon Test.
- Specify the two input variables under Object Inspector
> Data > Paired Samples Wilcoxon Test > Variable 1 and Variable 2.
OPTIONAL: Adjust any other options and settings as required.
- mu - Difference between the median of the two samples, as assumed under the null hypothesis.
- Alternative hypothesis - Use a two-sided or one-sided test.
- Type of test - Method by which the p-value is computed.
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Output
- Summary - Shows a nicely formatted table of the test results (default).
- R - The original text-based output from the wilcox.test function.
- Variable names - Display Variable Names in the output, instead of Variable Labels.
- More decimal places - Display numeric values with 8 decimal places.