VarCorr function

Extract Variance-Covariance Matrix

This function extracts the variance-covariance matrix of the random effects from a fitted nlmm object.

## S3 method for class 'nlmm'
VarCorr(x, sigma = NULL, ...)

Arguments

• x: an object of class "nlmm".
• sigma: not used.
• ...: not used.

Details

This function returns the variance or the variance-covariance matrix of the random effects. The generic function VarCorr is imported from the nlme package (Pinheiro et al, 2014).

References

Pinheiro J, Bates D, DebRoy S, Sarkar D and R Core Team (2014). nlme: Linear and Nonlinear Mixed Effects Models. R package version 3.1-117, https://CRAN.R-project.org/package=nlme.

Author(s)

Marco Geraci

See Also

nlmm

Examples

## Not run:

data(rats)
fit <- nlmm(y ~ trt*time, random = ~ time, group = id, data = rats, cov = "pdSymm",
control = nlmmControl(multistart = FALSE))

# Symmetric variance-covariance of random intercepts and slopes
VarCorr(fit)
## End(Not run)