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:
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),
'dropout time'=c(2,2,2,1,1,1,3,3,3)
)
Any help will be appreciated. Many thanks in advance.
james
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