RVAideMemoire (version 0.9-35)

friedman.rating.test: Friedman rank sum test for ratings

Description

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

Usage

friedman.rating.test(y, ...)

## S3 method for class 'default':
friedman.rating.test(y, groups, blocks, ...)

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

Arguments

y

response variable (preferably an ordered factor).

groups

a vector giving the group for the corresponding element of y.

blocks

a vector giving the block for the corresponding element of y.

formula

a formula of the form a ~ b | c, where a, b and c give the data values and corresponding groups and blocks, respectively. 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 friedman.test

Examples

set.seed(1608)
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])
block <- gl(10,3,labels=letters[1:10])
friedman.rating.test(response~fact|block)