coin (version 1.1-0)

rotarod: Rotating Rats

Description

The endurance time of 24 rats in two groups on a rotating cylinder.

Usage

rotarod

source

Bergmann, R., Ludbrook, J. and Spooren, W. P. J. M. (2000). Different outcomes of the Wilcoxon-Mann-Whitney test from different statistics packages. The American Statistician 54(1), 72--77.

Details

The rats were randomly assigned to receive a fixed oral dose of a centrally acting muscle relaxant ("treatment") or a saline solvent ("control"). The animals were placed on a rotating cylinder and the endurance time of each rat, i.e., the length of time each rat remained on the cylinder, was measured up to a maximum of 300 seconds.

This dataset is the basis of a comparison of 11 different software implementations of the Wilcoxon-Mann-Whitney test presented in Bergmann, Ludbrook and Spooren (2000).

Examples

## One-sided exact Wilcoxon-Mann-Whitney test (p = 0.0186)
wilcox_test(time ~ group, data = rotarod, distribution = "exact",
            alternative = "greater")

## Two-sided exact Wilcoxon-Mann-Whitney test (p = 0.0373)
wilcox_test(time ~ group, data = rotarod, distribution = "exact")

## Two-sided asymptotic Wilcoxon-Mann-Whitney test (p = 0.0147)
wilcox_test(time ~ group, data = rotarod)