R: Extract the Design of a linear mixed model

extract.lmeDesign {RLRsim} | R Documentation

## Extract the Design of a linear mixed model

### Description

These functions extract various elements of the design of a fitted `lme`-, `mer` or `lmerMod`-Object. They are called by `exactRLRT` and `exactLRT`.

### Usage

    extract.lmeDesign(m)

### Arguments

`m` | a fitted `lme`- or `merMod`-Object

### Value

a a list with components

- `Vr` estimated covariance of the random effects divided by the estimated variance of the residuals

- `X` design of the fixed effects

- `Z` design of the random effects

- `sigmasq` variance of the residuals

- `lambda` ratios of the variances of the random effects and the variance of the residuals

- `y` response variable

### Author(s)

Fabian Scheipl, `extract.lmerModDesign` by Ben Bolker. Many thanks to Andrzej Galecki and Tomasz Burzykowski for bug fixes.

### Examples

    library(nlme)
    design <- extract.lmeDesign(lme(distance ~ age + Sex, data = Orthodont,
                                 random = ~ 1))
    str(design)

[Package RLRsim version 3.1-7 Index]