Hi,
I have a question related to calculate time span between the first and last date within 2 variables group. My data looks like below, sorted by student_id test_id date. I need count time span between the first and last date for each test_id of each student_id. Thanks much in advance for your help!
My data:
student_id | test_id | date |
aaa | 123 | 05/06/2012 |
aaa | 123 | 06/07/2012 |
aaa | 123 | 02/06/2013 |
aaa | 345 | 12/17/2012 |
aaa | 345 | 07/22/2013 |
aaa | 345 | 11/11/2013 |
bbb | 234 | 02/29/2012 |
bbb | 234 | 05/30/2012 |
bbb | 789 | 07/19/2013 |
bbb | 789 | 07/31/2013 |
bbb | 789 |
09/30/2013 |
What I want is:
student_id |
test_id |
time_span |
aaa |
123 |
276 |
aaa |
345 |
329 |
bbb |
234 |
91 |
bbb |
789 |
73 |
Try this:
proc summary data=have nway;
class student_id test_id;
var date;
output out=want(drop=_:) range(date)=time_span;
format date best6.;
run;
Please fix your data.
Try this:
proc summary data=have nway;
class student_id test_id;
var date;
output out=want(drop=_:) range(date)=time_span;
format date best6.;
run;
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