fitSameMeanDifferentVarianceModel {compositions} | R Documentation |

## Fit Same Mean Different Variance Model

### Description

Fits a model of the same mean, but different variances model to a set of several multivariate normal groups by maximum likelihood.

### Usage

```
fitSameMeanDifferentVarianceModel(x)
```

### Arguments

`x` |
list of rmult type datasets |

### Details

The function tries to fit a normal model with different variances but the same mean between different groups.

### Value

`mean` |
the estimated mean |

`vars` |
a list of estimated variance-covariance matrices |

`N` |
a vector containing the sizes of the groups |

### Author(s)

K.Gerald v.d. Boogaart http://www.stat.boogaart.de

### References

Aitchison, J. (1986) *The Statistical Analysis of Compositional
Data* Monographs on Statistics and Applied Probability. Chapman &
Hall Ltd., London (UK). 416p.

### See Also

### Examples

```
fitSameMeanDifferentVarianceModel
```

[Package

*compositions*version 2.0-8 Index]