Hi all
Best wishes to all of you for 2021
I am trying to find a simple solution for the the data I have
data have;
input cusip_id Name $10. date_issue :ddmmyy10. datadate :ddmmyy10. ;
format date_issue ddmmyy10.;
format datadate ddmmyy10.;
datalines;
10343452 Henry PLC 01/04/2014 31/12/2012
10343452 Henry PLC 01/04/2014 31/12/2013
10343452 Henry PLC 01/04/2014 31/12/2014
10343452 Henry PLC 01/04/2014 31/12/2015
10343452 Henry PLC 01/04/2014 31/12/2016
;
run;
/*WHAT I WANT*/
data want ;
input cusip_id Name $10. date_issue :ddmmyy10. datadate :ddmmyy10. ;
format date_issue ddmmyy10.;
format datadate ddmmyy10.;
datalines;
10343452 Henry PLC 01/04/2014 31/12/2013
;
run;
My solution:
data have;
set have;
If dat_issue>=datadate;
run;
proc sort data=want out=want;
by cusip descending datadate ;
run;
proc sort data=want out=want nodupkeys;
by cusip ;
run;
Is there a way to be efficient and have this in a single step. Can this be done in proc sql when I join the cusip and issue_date with the dataset of compustat (that includes all the fiscal years i.ie datadate)?
Many thanks in advance
Regards
George
proc sql;
create table want as
select *,monotonic() as row_num from have where date_issue ge datadate group by cusip_id having max(row_num)=row_num;
quit;
proc sql;
create table want as
select *,monotonic() as row_num from have where date_issue ge datadate group by cusip_id having max(row_num)=row_num;
quit;
If your dataset is already sorted in ascending order, a double DO loop does it:
data want;
do until (last.cusip);
set have;
by cusip;
if datadate le date_issue then ref = datadate;
end;
do until (last.cusip);
set have;
by cusip;
if datadate = ref then output;
end;
drop ref;
run;
In SQL, try this
proc sql;
create table want as
select *
from have
where datadate le date_issue
group by cusip
having date_issue - datadate = min(date_issue - datadate)
;
quit;
Untested, posted from my tablet.
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