Hi,
I want to drop the last observations from my data set but want to keep them only if the date is 29dec2017. I am using the following code, although it works perfectly fine but I am just unsure how to incorporate the date clause in it.
data want(drop=count); set have; by permno descending date; if first.permno then count=0; count+1; if count>1; run;
I added the code in CAPS below. Check the date first, then set count to zero if not that day.
data want(drop=count);
set have;
by permno descending date;
IF DATE = "29DEC2017"d THEN COUNT=1;
ELSE if first.permno then count=0;
count+1;
if count>1;
run;
I added the code in CAPS below. Check the date first, then set count to zero if not that day.
data want(drop=count);
set have;
by permno descending date;
IF DATE = "29DEC2017"d THEN COUNT=1;
ELSE if first.permno then count=0;
count+1;
if count>1;
run;
Drop the last observation? How?
This:
data want(drop=count);
set have;
by permno descending date;
if first.permno then count=0;
count+1;
if count>1;
run;
is the same is that:
data want;
set have;
by permno descending date;
if first.permno then delete;
run;
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