ylag: Generate subject-level lagged response

In wgeesel: Weighted Generalized Estimating Equations and Model Selection

Description

Suppose you have longitudinal response y and it's subject id. This function generates lagged y for each subject.

Usage

ylag(id,y,lag,na=FALSE)

Arguments

id	subject id
y	response
lag	how many lags for y
na	logical; whether remain NAs in the response when lag >1. Default to FALSE and output 0s instead of NAs.

Value

return a vector of lagged y

Author(s)

Cong Xu, Zheng Li and Ming Wang

Examples

id <- rep(c(1:20),each=3)
y <- rnorm(length(id))
ylag(id,y,1) #lag=1
ylag(id,y,2,na=FALSE) #lag=2

wgeesel documentation built on May 2, 2019, 3:41 a.m.