title: How to use the Mann-Whitney test to detect a change in distribution for groups.
abstract: A simple test for a directional change in the distribution for groups is proposed based on the Mann-Whitney statistic. The practical usefulness of the test for an experiment on conditioned enhancement and conditioned suppression is presented.
mesh_terms: D000818:Animals; D003213:Conditioning, Psychological; D007858:Learning; D051381:Rats; D013223:Statistics as Topic