This function is used to test whether the medians of two populations are equal. This test requires input data to be matched pairs, for example, data from before and after a clinical operation. This test can be one- or two-tailed.
Unlike the paired-sample t-test, the paired-sample Wilcoxon Signed Rank test does not require the assumption that the populations are normally distributed. So when the normality is questionable, the paired sample Wilcoxon Signed Rank should be used to substitute the paired-sample t-test.
If there are missing values in the data range, the whole pair will be excluded in the analysis
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