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nina
2010 May 31
1
Creating dropout time from longitudinal data with missing data
Dear R users,
Please assist me with the following problem. I have a dataset that looks like the following:
dat<-data.frame(
'id'=rep(c(1,2,3),each=3),
'time'=rep(c(1,2,3),3),
'y'= c(2,2,NA,2,NA,NA,2,5,7)
)
I wish to create a variable for dropout time in dataframe 'dat' such that the dropout time is the time to drop out by the subject as follows: