Hello world,
I need some help collapsing data into a single row. I've created a data set that creates a flag for the test each student has taken (see table). The problem is I need this data to be one row per student and can't figure out how to code this properly. I've provided an example below.
Original Data:
Student | Test | Flag A | Flag B | Flag C |
---|---|---|---|---|
Carl | A | 1 | 0 | 0 |
Carl | B | 0 | 1 | 0 |
Tito | A | 1 | 0 | 0 |
Tito | B | 0 | 1 | 0 |
Tito | C | 0 | 0 | 1 |
Desired Output Data:
Student | Flag A | Flag B | Flag C |
---|---|---|---|
Carl | 1 | 1 | 0 |
Tito | 1 | 1 | 1 |
Is there a sas procedure I could use in this situation? Any help would be much appreciated.
Thanks!
Take the maximum for each flag over all records for that student.
proc means data=have nway ;
by student;
var flag: ;
output want max= ;
run;
Take the maximum for each flag over all records for that student.
proc means data=have nway ;
by student;
var flag: ;
output want max= ;
run;
Thank you
Hi,
Try with the following code...Although it is hard coded at one place to recreate the flags,it meets your requirement...
data have;
input student $ test $ flag1 - flag3;
cards4;
Carl A 1 0 0
Carl B 0 1 0
Tito A 1 0 0
Tito B 0 1 0
Tito C 0 0 1
;;;;
proc sql noprint;
create table have1 as
select student,count(student) as no_of_student
from have
group by 1;
select max(no_of_student) into :max
from have1;
quit;
data want(drop = i);
set have1;
array flag(&max.);
do i = 1 to &max.;
flag(i) = 1;
if no_of_student < &max. then do;
flag3 = 0;
end;
/*Based on your requirement, add more flags*/
end;
run;
-Urvish
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