Hi everyone,
I want to create a subset from a dataset. Suppose I have a table like below. What I want to do is keeping all those observations with the same value of Class_ID as what student 1111 has. In this case, I want to create a subset of all observations that the values of their class_ID are equal to 22 or 33.
Student_ID | Class_ID | Score |
1111 | 22 | A |
1111 | 33 | A |
2520 | 22 | A |
2520 | 44 | A |
5148 | 33 | A |
5148 | 66 | A |
6251 | 55 | A |
I appreciate any suggestion.
This won't scale to larger data, you need to be more explicit to what your problem is.
proc sql;
create table want as
select *
from have
where class_id in (select class_id from have where student_id = '1111');
quit;
data want;
set have;
where Class_id in (22,23);
run;
If Class_id is character then use ('22','23')
Actually the dataset is very large. So I can't easily find all values, like 22 or 33. I'm looking for an algorithm that can find all the values belonging to a certain student_ID, and then keep those observations that have the same value.
This won't scale to larger data, you need to be more explicit to what your problem is.
proc sql;
create table want as
select *
from have
where class_id in (select class_id from have where student_id = '1111');
quit;
Without further detail about what you are trying to do, my best suggestion would be the same as Reeza, assuming that for every case you know which student_id has the values you are looking for.
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