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Zerg
Calcite | Level 5

Hello all,

 

I currently have a data file looks like:

 

IDYearVar A
120000
120010
120021
120030
220000
220011
220021
220031
220040
320010
320020
320031
320040
320051
320060

 

What I need is excluding observations with Var A = 0 prior to the first time when Var A = 1 by the group ID. So the outcome of the data needs to look like:

 

IDYearVar A
120021
120030
220011
220021
220031
220040
320031
320040
320051
320060

 

How can I code it? Thank you.

1 ACCEPTED SOLUTION

Accepted Solutions
novinosrin
Tourmaline | Level 20
data have;
input ID	Year	Var_A;
datalines;
1	2000	0
1	2001	0
1	2002	1
1	2003	0
2	2000	0
2	2001	1
2	2002	1
2	2003	1
2	2004	0
3	2001	0
3	2002	0
3	2003	1
3	2004	0
3	2005	1
3	2006	0
;

data want;
__k=0;
do until(last.id);
set have;
by id;
if Var_A=1 then __k=1;
if __k then output;
end;
drop _:;
run;

View solution in original post

2 REPLIES 2
novinosrin
Tourmaline | Level 20
data have;
input ID	Year	Var_A;
datalines;
1	2000	0
1	2001	0
1	2002	1
1	2003	0
2	2000	0
2	2001	1
2	2002	1
2	2003	1
2	2004	0
3	2001	0
3	2002	0
3	2003	1
3	2004	0
3	2005	1
3	2006	0
;

data want;
__k=0;
do until(last.id);
set have;
by id;
if Var_A=1 then __k=1;
if __k then output;
end;
drop _:;
run;
Zerg
Calcite | Level 5
Thank you . It works perfectly. 🙂

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