Date:         Wed, 17 Nov 2004 20:41:25 -0800
Reply-To:     Jason Zhang <qiyuzhang2@YAHOO.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
Comments:     DomainKeys? See http://antispam.yahoo.com/domainkeys
From:         Jason Zhang <qiyuzhang2@YAHOO.COM>
Subject:      lag1() question
Content-Type: text/plain; charset=us-ascii

Hi,

I want to generate a value for a variable, say t. But
tĄ¯s value depends on previous observationĄ¯s t value.
I used the code:
T=lag1(t)*0.8;

It doesnĄ¯t work. The following is an example of what
I want to do:
data one;
input x;
cards;
1
2
3
4
5
6
;
run;

data two;
set one;
if _n_=1 then t=1; else
t=lag1(t)*0.8;
run;

what I expected for tĄ¯s values are:
1
0.8
0.64
Ą­

Can anyone help me with this? Thanks a lot!!!
Jason





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