tramME (version 0.0.1)

vcov.tramME: Calculate the variance-covariance matrix of the parameters

Description

Extracts the covariance matrix of the selected parameters. The returned values are on the same scale as the estimated parameter values, i.e. the standard deviations of the random effect terms are on log scale.

Usage

# S3 method for tramME
vcov(object, parm = NULL, pargroup = c("all", "fixef",
  "shift", "baseline", "ranef"), pmatch = FALSE, ...)

Arguments

object

A fitted tramME object.

parm

The indeces or names of the parameters of interest. See in details.

pargroup

fixef: fixed-effects, shift: shift parameters, all: fixed effects and variance component parameters, baseline: parameters of the baseline transformation function, ranef: variance components parameters.

pmatch

Logical. If TRUE, partial name matching is allowed.

...

Optional arguments

Value

A numeric covariance matrix.

Details

The argument parm defines the indices or the names of the parameters of interest within the selected pargroup. When pmatch = TRUE, partial matching of parameter names is allowed.

Examples

# NOT RUN {
data("sleepstudy", package = "lme4")
fit <- BoxCoxME(Reaction ~ Days + (Days | Subject), data = sleepstudy, order = 10)
vcov(fit)
vcov(fit, pargroup = "ranef")
vcov(fit, pargroup = "baseline")
vcov(fit, parm = "Reaction") ## same as previous
# }