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Mann–Whitney U test

a nonparametric test of centrality for ordinal data that contrasts scores from two independent samples to assess whether there are significant differences between the two sets of rankings. The statistic obtained from this test, U, is calculated by summing the number of ranks in one group that are smaller than each of the ranks in the other group. A Mann–Whitney U test is analogous to a one-way analysis of variance, except that the former is conducted with ranked data and the latter is conducted with continuous data. See also Wilcoxon–Mann–Whitney test. [Henry Berthold Mann (1905–2000), Austrian-born U.S. mathematician; Donald Ransom Whitney (1915–2001), U.S. statistician]

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Psychology term of the day

March 16th 2025

child care worker

child care worker

an individual trained to attend to children on a day-to-day basis in a variety of group settings, including child care centers, schools, businesses, private households, and health care institutions. Child care workers perform such tasks as dressing, feeding, bathing, and overseeing play.