> It isn't quite convenient to read the data posted below into R
> (if it was originally tab-separated, that formatting got lost) but
> ddply from the plyr package is good for this: something like (untested)
>
> d <- with(data,ddply(data,interaction(UniqueID,Reason),
> function(x) {
> ## make sure x is sorted by date/time here
> x$F_R <- c("F",rep("R",nrow(x)-1))
> x
> })
Or a little more succinctly:
d <- ddply(data, c("UniqueID", "Reason"), transform, F_R =
c("F",rep("R",nrow(x)-1))
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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