kendall {irr}R Documentation

Kendall's coefficient of concordance W

Description

Computes Kendall's coefficient of concordance as an index of interrater reliability of ordinal data. The coefficient could be corrected for ties within raters.

Usage

kendall(ratings, correct = FALSE)

Arguments

ratings n*m matrix or dataframe, n subjects m raters.
correct a logical indicating whether the coefficient should be corrected for ties within raters.

Details

Missing data are omitted in a listwise way.
Kendall's W should be corrected for ties if raters did not use a true ranking order for the subjects.
A test for the significance of Kendall's W is only valid for large samples.

Value

A list with class '"irrlist"' containing the following components:

$method a character string describing the method applied for the computation of interrater reliability.
$subjects the number of subjects examined.
$raters the number of raters.
$irr.name a character string specifying the name of the coefficient.
$value coefficient of interrater reliability.
$stat.name a character string specifying the name and the df of the corresponding chi-squared test.
$statistic the value of the test statistic.
$p.value the p-value for the test.
$error the character string of a warning message if ties were found within raters.

Author(s)

Matthias Gamer

References

Kendall, M.G. (1948). Rank correlation methods. London: Griffin.

See Also

cor, meanrho

Examples

data(anxiety)
kendall(anxiety, TRUE)

[Package irr version 0.70 Index]