The Wilcoxon/Mann-Whitney test is a common non-parametric test for comparing two samples with non-normal distributions and, thus, is a powerful substitute for the two-sample t-test. Mann-Whitney tests whether the samples are taken from populations with identical distributions. This test is performed on ranked data and therefore can be used for ordinal data.
The missing values in the data range will be excluded in the analysis
From Origin 2015, missing values in the grouping range and the corresponding data values will be excluded in analysis. In the previous version, missing values in the grouping range will be considered as a group.
To perform a Mann-Whitney test:
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