# dunn.test: Dunn's Test of Multiple Comparisons Using Rank Sums

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.

- Author
- Alexis Dinno <alexis.dinno@pdx.edu>
- Date of publication
- 2016-01-06 23:13:21
- Maintainer
- Alexis Dinno <alexis.dinno@pdx.edu>
- License
- GPL-2
- Version
- 1.3.2

## Man pages

## Files in this package

dunn.test |

dunn.test/NAMESPACE |

dunn.test/data |

dunn.test/data/homecare.rda |

dunn.test/R |

dunn.test/R/dunn.test.R |

dunn.test/MD5 |

dunn.test/DESCRIPTION |

dunn.test/man |

dunn.test/man/dunn.test.Rd |

dunn.test/man/homecare.Rd |