Data A;
Imput id A;
Cards;
1 7
2 10
3 11
3 13
Run;
I want to create a variable B such
that
1 7 7-4=3
2 10 10-1=9
3 11 11-11=0(id=3)
3 13 13-11=2(id=3)
data want;
set A;
by id;
B=a-lag(a);
if first.id then B=0;
run;
Not as well known, but equally effective here, is a cousin of the LAG function. These two statements produce identical results:
B=a-lag(a);
B=dif(a);
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