rankSum {ClassComparison}

Wilcoxon Rank-Sum Statistic

Description

Compute the Wilcoxon rank-sum statistic.

Usage

rankSum(data, selector)

Arguments

data

numeric vector

selector

logical vector the same length as data

Details

This is an efficient function to compute the value of the Wilcoxon rank-sum statistic without the extra overhead of the full wilcox.test function. It is used internally by the MultiWilcoxonTest class to perform row-by-row Wilcoxon tests.

Value

Returns an integer, the rank-sum of the subset of the data for which the selector is true.

Author(s)

Kevin R. Coombes [e-mail]

See Also

dwil, MultiWilcoxonTest

Examples

dd <- rnorm(100)
cc <- rep(c(TRUE, FALSE), each=50)
rankSum(dd, cc)