The Wilcoxon signed rank test of differences requires that the data be at least ordinal scaled and that the two samples are related.

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The Wilcoxon signed rank test of differences is a non-parametric test used to determine whether two related samples come from populations with different medians, and it requires that the data be at least ordinal scaled and that the two samples are related (i.e., the same individuals or objects are being compared across the two samples).

The Wilcoxon Signed Rank Test of Differences Requires That the Data