To use the Wilcoxin signed ranks test, the difference scores must be at least of ordinal scaling.

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The Wilcoxon signed ranks test is a non-parametric test used for paired samples, which means the data is measured on at least an ordinal scale. Therefore, the difference scores, which are calculated by subtracting one observation from another, must also be at least of ordinal scaling for the Wilcoxon signed ranks test to be applicable.

To Use the Wilcoxin Signed Ranks Test, the Difference Scores