The Wilcoxon rank sum test, also known as Mann-Whitney U-test, doesn’t make any assumption concerning the statistical distribution of words in a corpus (Wilcoxon 1945, Mann & Whitney 1947). It is based on a comparison of a sum of rank orders of texts in two text collections. The rank orders of texts are defined according to a frequency of a target word, without considering to which of both corpora this text belongs (see Lijffijt 2014). In our implementation, it sums up the frequencies per segment of document; for this reason, we consider it to be a dispersion-based rather than a frequency-based measure.
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