can anyone answer this query??
there is a input variable called X. need to derive variable called 'Y'.. the scenario is wherever there is 999 value there it has to add 0.1 to the previous x value.. if more than one 999 is there then the order should be 3.1, 3.2,3.3
X Y
1 1
2 2
3 3
4 4
999 4.1
1 1
2 2
3 3
999 3.1
999 3.2
Use the lag function.
X_lag = lag(X);
Y=ifn(X=999, x_lag+0.1, X);
This doesn't deal with consecutive 999 so you'll need to figure out the logic for that.
data have;
input X ;
cards;
1
2
3
4
999
1
2
3
999
999
;
run;
data want;
set have;
retain Y;
if X ne 999 then Y=X;
else Y=Y+0.1;
run;
Or more simple :
data want;
set have;
if X ne 999 then Y=X;
else Y+0.1;
run;
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