BookmarkSubscribeRSS Feed
🔒 This topic is solved and locked. Need further help from the community? Please sign in and ask a new question.
lillymaginta
Lapis Lazuli | Level 10

Hi ALl,

I have the following database 

id  drug_date drug 
1   1/1/2005   a       
1   1/1/2006  a        
1   2/2/2007  b        
1   3/3/2008  c 
1  3/4/2008   c
1  1/1/2004  a
1  2/2/2005   a
2  5/5/2009   a
2  6/6/2009  a
3  7/7/2007  b


I want the frequency of drugs per id, where each id is required to have the drug dispensed two times. For example id 1: had 4 dates for drug a. Count this as 1 since I need to dates for a per id.
for id 1, don't count b because the id has only one date for b.
For id 1, count c 1 since the id has two dates for c and so on. 
My output will be:
a 2 
b 0
c 1
1 ACCEPTED SOLUTION

Accepted Solutions
PGStats
Opal | Level 21

Your request translated into SQL:

 

proc sql;
create table want as
select 
    drug, 
    sum(rep>=2) as nbId
from
    (   select drug, id, count(*) as rep 
        from have group by drug, id       )
group by drug;
select * from want;
quit;
PG

View solution in original post

5 REPLIES 5
stat_sas
Ammonite | Level 13

proc sql;
select drug,sum(count) as count from (
select drug,count(distinct drug) as count from have
group by id,drug
having count(drug)>1)
group by drug;
quit;

PGStats
Opal | Level 21

@stat_sas, using a having clause eliminates drugs that were never prescribed twice (such as "b" here) from the output.

PG
PGStats
Opal | Level 21

Your request translated into SQL:

 

proc sql;
create table want as
select 
    drug, 
    sum(rep>=2) as nbId
from
    (   select drug, id, count(*) as rep 
        from have group by drug, id       )
group by drug;
select * from want;
quit;
PG
Ksharp
Super User
I am not sure I understand your requirement completely .
data have;
input id  drug_date : $20. drug $;
cards;
1   1/1/2005   a       
1   1/1/2006  a        
1   2/2/2007  b        
1   3/3/2008  c 
1  3/4/2008   c
1  1/1/2004  a
1  2/2/2005   a
2  5/5/2009   a
2  6/6/2009  a
3  7/7/2007  b
;
run;
proc summary data=have;
by id drug notsorted;
output out=temp;
run;
data temp;
 set temp;
 count=ifn(_freq_=1,0,1);
run;
proc summary data=temp nway;
class id drug ;
var count;
output out=want(drop=_:) sum=;
run;

lillymaginta
Lapis Lazuli | Level 10

Thank you all for posting suggestions! 

sas-innovate-2024.png

Join us for SAS Innovate April 16-19 at the Aria in Las Vegas. Bring the team and save big with our group pricing for a limited time only.

Pre-conference courses and tutorials are filling up fast and are always a sellout. Register today to reserve your seat.

 

Register now!

How to Concatenate Values

Learn how use the CAT functions in SAS to join values from multiple variables into a single value.

Find more tutorials on the SAS Users YouTube channel.

Click image to register for webinarClick image to register for webinar

Classroom Training Available!

Select SAS Training centers are offering in-person courses. View upcoming courses for:

View all other training opportunities.

Discussion stats
  • 5 replies
  • 899 views
  • 3 likes
  • 4 in conversation