Description Usage Arguments Details Value Author(s) References See Also Examples

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

1 |

`ratings` |
n*m matrix or dataframe, n subjects m raters. |

`correct` |
a logical indicating whether the coefficient should be corrected for ties within raters. |

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.

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. |

Matthias Gamer

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

1 2 |

```
Loading required package: lpSolve
Kendall's coefficient of concordance Wt
Subjects = 20
Raters = 3
Wt = 0.54
Chisq(19) = 30.8
p-value = 0.0429
```

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