Hi,
I want to isolate the first pre-and post observations.
For example,
data example;
input id year event;
datalines;
a 1990 0
a 1991 0
a 1992 0
a 1993 1
a 1994 0
a 1995 0
a 1996 1
a 1997 0
b 1993 0
b 1994 0
b 1995 1
b 1996 0
b 1997 1
b 1998 0
b 1999 0
;
run;
I want to get this dataset. like..
data hope;
input id year event;
datalines;
a 1990 0
a 1991 0
a 1992 0
a 1993 1
a 1994 0
a 1995 0
b 1993 0
b 1994 0
b 1995 1
b 1996 0
;
run;
please help!
Something like this?
data want(drop=flag);
set example;
by id;
if first.id then flag=0;
if event=1 then flag+1;
retain flag;
if flag<2;
run;
I don't follow the logic here. Please be more specific.
Something like this?
data want(drop=flag);
set example;
by id;
if first.id then flag=0;
if event=1 then flag+1;
retain flag;
if flag<2;
run;
No problem 🙂
data example;
input id $ year event;
datalines;
a 1990 0
a 1991 0
a 1992 0
a 1993 1
a 1994 0
a 1995 0
a 1996 1
a 1997 0
b 1993 0
b 1994 0
b 1995 1
b 1996 0
b 1997 1
b 1998 0
b 1999 0
;
run;
data want;
call missing(_e,__e);
do until(last.id);
set example;
by id year;
if event and not _e then _e=1;
else if event and _e then __e=1;
if not __e then output;
end;
drop _:;
run;
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