Wilcoxon matched pairs signed ranks T-test

A non-parametric significance test analogous to paired t-test. Most suitable for ordinal or interval/ratio variables. (Online Wilcoxon's Matched-Pairs Testand Wilcoxon's Two Independent Samples Test.). It is used to test for the significance of the difference between the distributions of two non-independent samples (repeated measures or matched pairs). (Alternative Online Wilcoxon's Signed-Ranks (W) Test.)