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Date:         Sun, 16 Oct 2011 01:49:32 -0400
Reply-To:     Randy <randistan69@HOTMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Randy <randistan69@HOTMAIL.COM>
Subject:      Lagging Groups

Dear All:
 I need to lag the data set by groups.  My data set is as follows:


Date              Group         VarA
01OCT2011           1             1
01OCT2011           1             1
01OCT2011           1             1
02OCT2011           1             0
02OCT2011           1             0
01OCT2011           2             0
01OCT2011           2             0
02OCT2011           2             1
02OCT2011           2             1
02OCT2011           2             1


The data that I need are as follows:


Date              Group         VarA      LagVarA
01OCT2011           1             1         0
01OCT2011           1             1         0
01OCT2011           1             1         0
02OCT2011           1             0         1
02OCT2011           1             0         1
01OCT2011           2             0         0
01OCT2011           2             0         0
02OCT2011           2             1         0
02OCT2011           2             1         0
02OCT2011           2             1         0


Note:  LagVARA on the first date of each group will always = 0. Please Help


Randy
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