R: Coxme variance function

coxmeMlist {coxme} | R Documentation

## Coxme variance function

### Description

This variance function accepts a list of matrices, which define a correlation structure for a coxme fit.

### Usage

    coxmeMlist(varlist, rescale = FALSE, pdcheck = TRUE, positive = TRUE)

### Arguments

`varlist` | a list containing one or more matrix or bdsmatrix objects.
`rescale` | if TRUE, each input matrix is rescaled to have a diagonal of 1. (Kinship matrices for instance are often generated with a diagonal of .5 and would be multiplied by 2).
`pdcheck` | check each matrix to ensure that it is positive definite
`positive` | constrain coefficients to be positive. This may also be a vector of the same length as `varlist`

### Details

If two matrices A and B were given, this fits the variance structure V = s1 A + s2 B, where the variances s1 and s2 are parameters that will be optimized by `coxme`, treating A and B as fixed.

### Value

a coxme variance family object, used by `coxme` in the fitting process.

### Author(s)

Terry Therneau

### See Also

`coxme`

[Package coxme version 2.2-7 Index]