Date:         Fri, 16 Jul 2010 18:09:29 -0400
Reply-To:     Randy <randistan69@HOTMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Randy <randistan69@HOTMAIL.COM>
Subject:      Flag Differences

My Data set is as folloows:

ID  VarA
1   25
1   36
1   36
1   47
1   68
2   78
2   64
2   64

The data set I want is

ID  VarA   Flag_DIFF
1   25       0
1   36       0
1   36       1
1   47       0
1   68       0
2   78       0
2   64       0
2   64       1

Once again, there is a long solution.  I can create a variable, lag_VarA,
and then construct the Flag_DIFF Variable.  Since my data set is huge, is
there a more efficient solution?
I do not understand the IFN function well enough.  Where can I read up on it?
                 Randy