Date:         Thu, 22 Mar 2012 12:28:05 +0000
Reply-To:     "Beckstead, Jason" <jbeckste@health.usf.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         "Beckstead, Jason" <jbeckste@health.usf.edu>
Subject:      conditional compute within a macro
Content-Type: multipart/alternative;

Listers,
I am trying to compute a lagged variable within a macro using CONDITIONAL, !IF !THEN, but having no luck.
can anyone offer assistance? Below is simplified data set/structure and current macro attempt.

Thanks.

DATA LIST FREE/ ID DAY X.
BEGIN DATA.
1 1 10
1 2 15
1 3 20
1 4 25
1 5 30
2 1 20
2 2 21
2 3 22
2 4 23
3 1 33
3 2 33
3 3 34
3 4 36
3 5 38
3 6 39
END DATA.
COMPUTE LAGID=LAG(ID,1).
LIST.

DEFINE !LAGGY (!POS = !TOKENS(1)).
!IF (ID !EQ LAGID) !THEN
 COMPUTE !CONCAT('LAG1',!1) = LAG(!1,1).
EXE.
!IFEND.
!ENDDEFINE.
!LAGGY X.
LIST.


_____________________________________________________________
 Jason W. Beckstead, Ph.D.
  Associate Professor/Quantitative Methodologist
  University of South Florida College of Nursing
  12901 Bruce B. Downs Blvd., MDC22, Tampa, FL 33612, USA
  Statistical Editor, International Journal of Nursing Studies
  phone: +1.813.974.7667  fax: +1.813.974.5418
  personal website:  http://personal.health.usf.edu/jbeckste/
  International Journal of Nursing Studies  http://www.elsevier.com/ijns




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