R: Approximate stratum variances

asv {asreml} | R Documentation

## Approximate stratum variances

### Description

Generic function to calculate approximate stratum variances, degrees of freedom and coefficients for variance component models. The available method is for `asreml` class objects.

### Usage

    asv(object, ...)

### Arguments

`object` | An object of class `asreml`.
`...` | Arguments to `asv.asreml`

### Details

For linear mixed effects model, it is often possible to consider a natural ordering of the variance component parameters, including the residual. Based on an idea due to Thompson, 1980; here, `asreml` computes approximate stratum degrees of freedom and stratum variances by a modified Cholesky diagonalisation of the average information matrix.

### See Also

`asv.asreml`

[Package asreml version 4.2.0.480 Index]