RVAideMemoire (version 0.9-35)

wilcox.rating.test: Wilcoxon rank sum and signed rank tests for ratings

Description

Wrapper for wilcox.test with ratings (ordinal response variables).

Usage

wilcox.rating.test(x, ...)

## S3 method for class 'default':
wilcox.rating.test(x, y = NULL, mu = NULL, ...)

## S3 method for class 'formula':
wilcox.rating.test(formula, data, subset, na.action, ...)

Arguments

x

response variable (preferably an ordered factor).

y

an optional second response variable (preferably an ordered factor) to be compared with x.

mu

a character string giving a theoretical rating to be compared with x in one-sample tests.

formula

a formula of the form a ~ b, where a and b give the data values and corresponding groups. It is preferable that a is an ordered factor.

data

an optional data frame containing the variables in the formula formula. By default the variables are taken from environment(formula).

subset

an optional vector specifying a subset of observations to be used.

na.action

a function which indicates what should happen when the data contain NAs. Defaults to getOption("na.action").

...

further arguments to be passed to or from other methods.

Value

• See wilcox.test

Examples

set.seed(1719)
response <- factor(sample(1:6,30,replace=TRUE),levels=c("1","2","3","4","5","6"),ordered=TRUE)
fact <- gl(2,15,labels=LETTERS[1:2])
wilcox.rating.test(response~fact)