ipdmeta (version 1.1)

frailty.model.matrix: Design matrix for random effects in Cox mixed effects model

Description

Returns matrix of n by number of cluster effects design matrix.

Usage

frailty.model.matrix(random,data)

Arguments

random

formula for the random components as would be stated in coxme

data

Data frame containing the observed outcomes

Value

• Matrix of cluster effect design matrices.

Examples

data(cancer.rats)

#RANDOM EFFECTS "DESIGN MATRIX"
#BASELINE FRAILTY, 50 LITTERS 3 RATS IN EACH LITTER

frailty.model.matrix(~(1|litter),cancer.rats)