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Date:         Fri, 7 Feb 1997 10:23:14 -0800
Reply-To:, BWRogers@MSN.COM
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         Bruce Rogers <gxx18300@GGR.CO.UK>
Organization: Medical IR, Glaxo Wellcome
Subject:      Re: adding records to a dataset
Comments: To: jupiterbowl <>
Content-Type: text/plain; charset=us-ascii

jupiterbowl wrote: >

> Is there a general strategy for adding records to reflect a missing value > for SCORE in the missing months (Months 2,4-11 in the above case), besides > editing the dataset the hard way? >


There are several ways of doing this in a data step, one of which I've included below (there may be better ways, but I don't have time to examine all the possibilities right now) . I think it's pretty self-explanatory, but if not email me and I'll fill in the details.

data new ; set old; by client ; drop stormon storscor prevmon ;

prevmon = lag(month) ; stormon = month ; storscor = score ;

if first.client then prevmon = 0 ; do month = (prevmon+1) to (stormon-1) ; score = . ; output ; end;

score = storscor ; month = stormon ; output ;

if last.client & month ^= 12 then do month = (stormon+1) to 12 ; score = . ; output ; end; run;

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