Description Usage Arguments Details Value Bain t_test References Examples

Performs Bartlett's test of the null that the variances in each of the groups (samples) are the same.

1 2 3 4 | ```
bartlett_test(x, g, ...)
## Default S3 method:
bartlett_test(x, g, ...)
``` |

`x` |
a numeric vector of data values, or a list of numeric data vectors representing the respective samples, or fitted linear model objects (inheriting from class "lm"). |

`g` |
a vector or factor object giving the group for the corresponding elements of x. Ignored if x is a list. |

`...` |
further arguments to be passed to or from methods. |

`x`

must be a numeric data vector, and `g`

must be a vector or factor object of the same length as `x`

giving the group for the corresponding elements of `x`

.

A list with class `"bartlett_htest"`

containing the following
components:

`statistic` |
Bartlett's K-squared test statistic. |

`parameter` |
the degrees of freedom of the approximate chi-squared distribution of the test statistic. |

`p.value` |
the p-value of the test. |

`conf.int` |
a confidence interval for the mean appropriate to the specified alternative hypothesis. |

`method` |
the character string "Bartlett test of homogeneity of variances". |

`data.name` |
a character string giving the names of the data. |

`vars` |
the sample variances across groups (samples). |

`n` |
the number of observations per group (sample) |

In order to allow users to enjoy the functionality of bain with the familiar
stats-function `bartlett.test`

, we have had to make minor changes to the
function `bartlett.test.default`

. All rights to, and credit for, the
function `bartlett.test.default`

belong to the R Core Team, as indicated in the original license below.
We make no claims to copyright and incur no liability with regard to the
changes implemented in `bartlett_test`

.

This the original copyright notice by the R core team: File src/library/stats/R/bartlett_test.R Part of the R package, https://www.R-project.org

Copyright (C) 1995-2015 The R Core Team

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

A copy of the GNU General Public License is available at https://www.R-project.org/Licenses/

Bartlett, M. S. (1937). Properties of sufficiency and statistical tests. Proceedings of the Royal Society of London Series A 160, 268–282. DOI: 10.1098/rspa.1937.0109.

1 2 3 4 | ```
require(graphics)
plot(count ~ spray, data = InsectSprays)
bartlett_test(InsectSprays$count, InsectSprays$spray)
``` |

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