R: Extraction functions for Lmekin

fixef.lmekin {coxme} | R Documentation

## Extraction functions for Lmekin

### Description

Extract the fixed effects, random effects, variance of the fixed effects, or variance of the random effects from a linear mixed effects model fit with lmekin.

### Usage

    ## S3 method for class 'lmekin'
    fixef(object, ...)
    ## S3 method for class 'lmekin'
    ranef(object, ...)
    ## S3 method for class 'lmekin'
    vcov(object, ...)
    ## S3 method for class 'lmekin'
    VarCorr(x, ...)
    ## S3 method for class 'lmekin'
    logLik(object, ...)

### Arguments

`object` | an object inheriting from class `lmekin` representing the result of a mixed effects model.
`x` | an object inheriting from class `lmekin` representing the result of a mixed effects model.
`...` | some methods for this generic require additional arguments. None are used in this method.

### Details

For the random effects model y = X beta + Zb + e, let s^2 be the variance of the error term e. Let A = sP be the variance of the random effects b. There is a computational advantage to solving the problem in terms of P instead of A, and that is what is stored in the returned lmekin object. The `VarCorr` function returns elements of P; the print and summary functions report values of A. Pinhiero and Bates call P the precision factor.

### Value

the fixed effects are a vector and vcov returns their variance/covariance matrix. The random effects are a list with one element for each random effect. The ranef component contains the coefficients and VarCorr the estimated variance/covariance matrix. The logLik method returns the loglikelihood along with its degrees of freedom.

### Author(s)

Terry Therneau

### References

J Pinheiro and D Bates, Mixed-effects models in S and S-Plus. Springer, 2000.

### See Also

`lmekin`, `random.effects`, `fixed.effects`, `link{vcov}`, `VarCorr`

### Examples

    data(ergoStool, package="nlme")  # use a data set from nlme
    efit <-  lmekin(effort ~ Type + (1|Subject), ergoStool)
    ranef(efit)

[Package coxme version 2.2-7 Index]