RVAideMemoire (version 0.9-35)

kruskal.rating.test: Kruskal-Wallis rank sum test for ratings

Description

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

Usage

kruskal.rating.test(x, ...)

## S3 method for class 'default':
kruskal.rating.test(x, g, ...)

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

Arguments

x

response variable (preferably an ordered factor).

g

a factor giving the group for the corresponding element of x.

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 kruskal.test

Examples

set.seed(1609)
response <- factor(sample(1:6,30,replace=TRUE),levels=c("1","2","3","4","5","6"),ordered=TRUE)
fact <- gl(3,1,30,labels=LETTERS[1:3])
kruskal.rating.test(response~fact)