Many thanks for this, I will try this code. Much appreciated.
-----Original Message-----
From: Peter Dalgaard [mailto:p.dalga...@biostat.ku.dk]
Sent: 22 April 2009 22:05
To: David Winsemius
Cc: Bronagh Grimes; r-help@r-project.org
Subject: Re: [R] Count Code
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.)
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
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
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
