RE: Random Effect Structure

In LMMstar: Repeated Measurement Models for Discrete Times

Random Effect Structure

Description

Variance-covariance structure parametrized via random effects. Can be stratified on a categorical variable.

Usage

RE(formula, var.cluster, var.time, ranef = NULL, add.time)

Arguments

formula	formula indicating on which variable to stratify the residual variance and correlation (left hand side) and variables influencing the residual variance and correlation (right hand side).##'
var.cluster	[character] cluster variable.
var.time	[character] time variable.
ranef	[list] characteristics of the random effects
add.time	not used.

Details

A typical formula would be ~1, indicating a variance constant over time and the same correlation between all pairs of times.

Value

An object of class CS that can be passed to the argument structure of the lmm function.

Examples

RE(~1, var.cluster = "id", var.time = "time")
RE(~gender, var.cluster = "id", var.time = "time")
RE(gender~(1|id), var.time = "time")

LMMstar documentation built on Nov. 9, 2023, 1:06 a.m.