R: Default identity variance models

indep_vs {asreml} | R Documentation

## Default identity variance models

### Description

Model functions for identity variance structures.

### Usage

    id(obj)

    idv(obj, init = NA)

    idh(obj, init = NA)

### Arguments

`obj` | A factor in `data`.
`init` | Optional vector of initial values with an optional `names` attribute from the set `"P"`, `"U"`, and `"F"`, specifying the boundary constraint for each parameter as positive, unconstrained or fixed, respectively.

### Details

The class of identity models includes the null correlation model `id`, and its homogeneous and heterogeneous variance forms `idv` and `idh`, respectively.

### Functions

- `asr_id()`: Identity correlation model (no variance associated).

- `asr_idv()`: Identity variance model.

- `asr_idh()`: Heterogeneous identity (diagonal) variance model.

[Package asreml version 4.2.0.480 Index]