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Date:         Sat, 16 Aug 1997 18:09:45 +-300
Reply-To:     001 <jucha@NETVISION.NET.IL>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         001 <jucha@NETVISION.NET.IL>
Subject:      Re: Crack this
Content-Type: text/plain; charset="us-ascii"

Henrik wrote:

>>> I have a number of patients with a number of event dates. I would like >>> to create datasets with patients who have more than one event at the >>> same date, more than one event within 1, 2, 3, 4, 5, 6, 7 days.

>>> My dataset looks something like this:

>>> PATID EVENTDAT >>> 1 970303 >>> 1 970303 >>> 1 970405 >>> 2 970205 >>> 3 960725 >>> 3 960830 >>> 3 960902

>>> Maybe I can use the lag function but I am not sure how to code for this >>> problem. >>> Any suggestions?

Dear Henrik, I suggest you to try the following:

data a; input EVENTDAT yymmdd6. PATID; cards; 970303 1 970303 1 970405 1 970205 2 960725 3 960830 3 960902 3 ; run; proc sort data=a;by patid eventdat;run; data a0(keep=patid) a3(keep=patid) out(keep=patid); set a; by patid; retain mindif; ddat=dif(eventdat); if first.patid then do; ddat=.; mindif=.; end; mindif=min(ddat,mindif); if last.patid; if mindif=0 then output a0; if mindif=3 then output a3; if mindif=. or 7<mindif then output out; run;

Elik Jucha Statistics


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