topic Get Most recent date unless other variables are more complete in SAS Programming

Get Most recent date unless other variables are more complete

luvscandy27 — Fri, 21 Apr 2023 16:44:54 GMT

Hello everyone,

I have a dataset with millions of records. What I would like to do is keep the most recent date by id unless

the other 4 rating variables are more complete. Any assistance would be appreciated .This is the sample dataset:

id	date	rate_1	rate_2	rate_3	rate_4
100	3/3/2023	1	1	1	1
100	2/27/2023	1	1	1	1
100	1/21/2023	1	1	1	1
100	12/28/2022	1	1	1	1
200	3/4/2023	.	.	.	.
200	1/21/2023	1	1	1	1

and this is what I would like to end up with :

id	date	rate_1	rate_2	rate_3	rate_4
100	3/3/2023	1	1	1	1
200	1/21/2023	1	1	1	1

The code for the sample dataset is:

data test1;
 infile datalines delimiter = ',';
 input id $ date:mmddyy10. rate_1 rate_2 rate_3 rate_4 ;
 format  date mmddyy10.;
 datalines;
 100,03/03/2023,1,1,1,1,
 100,02/27/2023,1,1,1,1,
 100,01/21/2023,1,1,1,1,
 100,12/28/2022,1,1,1,1,
 200,03/04/2023,.,.,.,.,
 200,01/21/2023,1,1,1,1
 ;
 run;

Re: Get Most recent date unless other variables are more complete

Quentin — Fri, 21 Apr 2023 16:56:39 GMT

If it's not too big to sort, you could compute N and then sort the data by ID N Date, and grab the last record per ID. Something like:

data test2 ;
  set test1 ;
  n=n(of rate: ) ;
run ;

proc sort data=test2 ;
  by id n date ;
run ;

data want ;
  set test2 ;
  by id n date ;
  if last.id ;
  drop n ;
run ;

Re: Get Most recent date unless other variables are more complete

FreelanceReinh — Fri, 21 Apr 2023 17:03:15 GMT

Hello @luvscandy27,

Alternatively, you can use a single PROC SQL step:

proc sql;
create table want(drop=c) as
select *, 1e6*n(rate_1,rate_2,rate_3,rate_4)+date as c from test1
group by id
having c=max(c);
quit;

Re: Get Most recent date unless other variables are more complete

vijaypratap0195 — Fri, 21 Apr 2023 17:07:48 GMT

I believe you can achieve this by using proc sort and last.id-

Try this-

proc sort data=test1; by id date; run;
 
data tmp;
set test1;
by id;
if sum(of rate_:) = 4;
run;
 
proc sort data=tmp; by id ; run;
  
data tmp1;
set tmp;
by id;
if last.id;
run;

-Vijay