# dunn.test (1.3.0)

Dunn's Test of Multiple Comparisons Using Rank Sums.

http://cran.r-project.org/web/packages/dunn.test

Computes Dunn's test (1964) for stochastic dominance and reports the results among multiple pairwise comparisons after a Kruskal-Wallis test for stochastic dominance among k groups (Kruskal and Wallis, 1952). The interpretation of stochastic dominance requires an assumption that the CDF of one group does not cross the CDF of the other. 'dunn.test' makes k(k-1)/2 multiple pairwise comparisons based on Dunn's z-test-statistic approximations to the actual rank statistics. The null hypothesis for each pairwise comparison is that the probability of observing a randomly selected value from the first group that is larger than a randomly selected value from the second group equals one half; this null hypothesis corresponds to that of the Wilcoxon-Mann-Whitney rank-sum test. Like the rank-sum test, if the data can be assumed to be continuous, and the distributions are assumed identical except for a difference in location, Dunn's test may be understood as a test for median difference. 'dunn.test' accounts for tied ranks.

**Maintainer**:
Alexis Dinno

**Author(s)**: Alexis Dinno <alexis.dinno@pdx.edu>

**License**: GPL-2

**Uses**: Does not use any package

**Reverse suggests**: FSA

Released about 4 years ago.