Charles Edward Spearman (1863-1945),anEnglishpsychologistknownforSpearmansrankcorrelationcoefficient.Frank Wilcoxon(18921965),chemistandstatistician,inventoroftwonon-parametrictestsforstatisticalsignificance:TheWilcoxonsigned-ranktest;TheWilcoxonrank-sumtest(alsoknownastheMann-WhitneyUtest).Instatistics,theMannWhitney Utest(alsocalledtheMannWhitneyWilcoxon(MWW),Wilcoxon rank-sum test,orWilcoxonMannWhitneytest)isanon-parametrictestforassessingwhethertwoindependentsamplesofobservationscomefromthes
