help sum calculation by patient id

[leahcho]

Hi I need help with calculating the sum of observation by ID

My data look like this;

ID   drug  day_supply

1     A       30

1     A       30

1     B      10

2     B      15

2     B      15

2     B      15

I want to create a variable that sums up the day_supply

ID   drug    Total_day_supply

1     A                       60

1     B                       10

2     B                       45

Thanks in advance!

[kiranv_]

something like this

proc sql;
create table newtable as
select id, drug, sum(day_supply) as total_day_supply
from yourtable
group by id, drug;
quit;

[art297 · Accepted solution]

Alternatively, you could use proc summary:

data have;
  input ID   drug $ day_supply;
  cards;
1     A       30
1     A       30
1     B      10
2     B      15
2     B      15
2     B      15
;

proc summary data=have;
  var day_supply;
  by id drug;
  output out=want (drop=_:) sum=total_day_supply;
run;

Art, CEO, AnalystFinder.com

[leahcho]

Thanks you all for providing the answers.