signed rank test

signed rank test
a nonparametric statistical test for ordinal data, comparing two populations of data by examining the differences between matched pairs in the two populations. It is based on the signed rank statistic, calculated by arranging all samples in order without regard to which population they are drawn from, identifying pairs, assessing the difference in rankings for the members of each pair, and summing these differences for all pairs. If the null hypothesis is true and there is no difference between the two populations, the median difference in rankings between matched pairs in the population approximates 0. Called also Wilcoxon signed rank t.

Medical dictionary. 2011.

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