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Date:   Sun, 2 May 2004 19:15:05 -0400
Reply-To:   Quentin McMullen <quentin_mcmullen@BROWN.EDU>
Sender:   "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:   Quentin McMullen <quentin_mcmullen@BROWN.EDU>
Subject:   Re: Find out all firms with the same id and same icode
Comments:   To: sportsfun77@HOTMAIL.COM

On Sun, 2 May 2004 09:34:16 -0700, sportsfun <sportsfun77@HOTMAIL.COM> wrote:

>Hi, > >My data looks like this: > >ID ICODE NUM; >1000 2000 3 >1000 2000 3 >1000 2000 3 >1001 2020 2 >1001 1010 2 >1002 1010 3 >1002 1010 3 >1002 1020 3 > >ID is the firm id, ICODE is another variable, NUM is the number of >firms that share the same id. I want to find out that for all firms >that share the same id, if they also share the same icode (for example >for id 1000), I will put them in a separate dataset. For all the other >firms (e.g., id 1001 and 1002), not all the firms share the same id >also share the same icode, I will put them in a different dataset. How >can I do this? > >Thanks a lot! > >Fun

I see you've already got an array response. Here are a couple other methods, and there are yet more (as always)...

data a; input id icode num; cards; 1000 2000 3 1000 2000 3 1000 2000 3 1001 2020 2 1001 1010 2 1002 1010 3 1002 1010 3 1002 1020 3 ; run;

*I just read Howard Schreier's NESUG 2003 paper on the self-interleave; *Below is my first attempt, so user beware ;

data sameicode difficode; set a (in=preview) a ; retain dif firstIcode; by id; if preview then do; if first.id then do; dif=0; firstIcode=icode; end; else if icode ne firstIcode then dif=1; end; else do; if dif=1 then output difficode; else output sameicode; end; drop firstIcode dif; run;

*and also a quick-n-dirty SQL solution; *note the max() and min() functions will ignore missings, not an issue; *in the sample data ;

proc sql; create table same as select * from a group by id having max(icode)=min(icode) ; create table diff as select * from a group by id having max(icode) ne min(icode) ; quit;

Kind Regards, --Quentin


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