Hi,
I have a panel dataset like below.
data have;
input firmID $ Year ;
datalines;
A 1995
A 1996
A 1997
A 1998
B 1997
B 1998
B 1999
B 2000
;
run;
I would like to delete the first two years for each firm. The expected output is below.
data have;
input firmID $ Year;
datalines;
A 1997
A 1998
B 1999
B 2000
;
run;
What program do I need to use? Thanks!!
Use a counter with by-group processing, and a subsetting if:
data want;
set have;
by firmid;
if first.firmid
then counter = 1;
else counter + 1;
if counter > 2;
drop counter;
run;
Use a counter with by-group processing, and a subsetting if:
data want;
set have;
by firmid;
if first.firmid
then counter = 1;
else counter + 1;
if counter > 2;
drop counter;
run;
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