Copyright | (c) 2014 Danny Navarro |
---|---|

License | BSD3 |

Maintainer | bos@serpentine.com |

Stability | experimental |

Portability | portable |

Safe Haskell | None |

Language | Haskell98 |

- kruskalWallisRank :: [Sample] -> [Sample]
- kruskalWallis :: [Sample] -> Double
- kruskalWallisSignificant :: [Int] -> Double -> Double -> Maybe TestResult
- kruskalWallisTest :: Double -> [Sample] -> Maybe TestResult

# Documentation

kruskalWallisRank :: [Sample] -> [Sample] Source

Kruskal-Wallis ranking.

All values are replaced by the absolute rank in the combined samples.

The samples and values need not to be ordered but the values in the result are ordered. Assigned ranks (ties are given their average rank).

kruskalWallis :: [Sample] -> Double Source

The Kruskal-Wallis Test.

In textbooks the output value is usually represented by `K`

or `H`

. This
function already does the ranking.

kruskalWallisSignificant Source

:: [Int] | The samples' size |

-> Double | The p-value at which to test (e.g. 0.05) |

-> Double | K value from |

-> Maybe TestResult |

Calculates whether the Kruskal-Wallis test is significant.

It uses *Chi-Squared* distribution for aproximation as long as the sizes are
larger than 5. Otherwise the test returns `Nothing`

.

kruskalWallisTest :: Double -> [Sample] -> Maybe TestResult Source

Perform Kruskal-Wallis Test for the given samples and required
significance. For additional information check `kruskalWallis`

. This is just
a helper function.