Generate subject-level lagged response
Suppose you have longitudinal response y and it's subject id. This function generates lagged y for each subject.
ylag(id,y,lag,na=FALSE)
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. |
return a vector of lagged y
Cong Xu, Zheng Li and Ming Wang
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
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