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Date:         Tue, 25 Aug 2009 09:06:20 -0700
Reply-To:     olivesecret <olivesecret@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         olivesecret <olivesecret@GMAIL.COM>
Subject:      Re: problems in data step
Comments: To:
Content-Type: text/plain; charset=ISO-8859-1

On Aug 25, 11:43 am, billyk <> wrote: > On Aug 25, 11:09 am, olivesecret <> wrote: > > > Hi I have a data set consisting of ID, response variable y and others. > > There are several obs for each ID. How can I remove those IDs with > > same values on y? In other words, if for one ID, all of obs have the > > same value of y, then I remove all of obs belonging to this ID. Thanks > > for any input! > > Try this.... > > proc sort data=old; by id y; run; > data new; > set old; > by id y; > if first.y; > run;

Your way will keep obs with unique y for each ID. This is different from what I want. What I need is, remove those IDs which have the same y in all of its obs.

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