ID: identity Structure

In LMMstar: Repeated Measurement Models for Discrete Times

identity Structure

Description

Variance-covariance structure where the residuals are independent and identically distributed. Can be stratified on a categorical variable.

Usage

ID(formula, var.cluster, var.time, add.time)

Arguments

formula	formula indicating on which variable to stratify the residual variance (left hand side).
var.cluster	[character] cluster variable.
var.time	[character] time variable.
add.time	not used.

Details

A typical formula would be ~1.

Value

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

Examples

ID(NULL, var.cluster = "id", var.time = "time")
ID(~1, var.cluster = "id", var.time = "time")
ID(~gender, var.cluster = "id", var.time = "time")
ID(gender~1, var.cluster = "id", var.time = "time")

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