cc02-1-dwil: Wilcoxon Density Function
In ClassComparison: Classes and Methods for "Class Comparison" Problems on Microarrays

dwil	R Documentation

Wilcoxon Density Function

Description

Computes the density function for the Wilcoxon rank-sum distribution without centering.

Usage

dwil(q, m, n)

Arguments

`q`	vector of quantiles
`m`	number of observations in the first sample
`n`	number of observations in the second sample

Details

Computes the density function for the Wilcoxon rank-sum distribution, using exact values when both groups have fewer than 50 items and switching to a normal approximation otherwise. It was originally written for S-Plus, which still perversely insists that m and n must be less than 50. The function was retained when the OOMPA library was ported to R, since S-Plus keeps the actual rank-sum but R centers the distribution at zero. This function encapsulated the difference, allowing everything else to continue to work as it had worked previously.