David Winsemius wrote:
On Apr 22, 2009, at 3:42 PM, Bronagh Grimes wrote:
Hi there,
I am interested in converting SAS code to R & I wondered if anyone had
any quick R code/tips for the following piece of test SAS code?
Any feedback greatly appreciated.
data A1;
set A1;
count + 1;
by subject_id;
if first.subject_id then count = 1;
run;
There were several solution offered a couple of months back to the
challenge of replicating the features of the SAS _N_ construct. At least
that is my memory of how it looks in SAS. You probably have the right
books to consult for that question to construct a proper search:
I think this one could be
count <- ave(a1$subject_id, a1$subject_id, FUN = seq_along)
(assuming that "count+1;" increases the value from the previous record.)
--
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c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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