Message-ID: <49EF8693.70303@biostat.ku.dk>
Date: 2009-04-22T21:05:23Z
From: Peter Dalgaard
Subject: Count Code
In-Reply-To: <79389F38-7CB4-4564-882D-50B2EEEB1E36@comcast.net>
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 ?ster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907