I have a 3:1 nested case control matched sample dataset with match_id assigned per group
id | match_id | event |
1 | 1 | 0 |
4 | 1 | 0 |
9 | 1 | 0 |
10 | 1 | 1 |
5 | 2 | 0 |
11 | 2 | 0 |
12 | 2 | 0 |
13 | 3 | 1 |
8 | 3 | 0 |
16 | 3 | 0 |
17 | 3 | 0 |
I want to remove observations who have less than 4 of the same match_id (in this example observations with match_id=2).
proc sql;
create table have1 as
select*, count(*) as total_id
from have
group by match_id;
quit;
proc print;run;
data want;
set have1;
where total_id gt 3;
proc print;run;
proc sql;
create table have1 as
select*, count(*) as total_id
from have
group by match_id;
quit;
proc print;run;
data want;
set have1;
where total_id gt 3;
proc print;run;
Available on demand!
Missed SAS Innovate Las Vegas? Watch all the action for free! View the keynotes, general sessions and 22 breakouts on demand.
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.
Select SAS Training centers are offering in-person courses. View upcoming courses for: