data have;
input id_no visit measurement;
cards;
11 1 110
11 1 120
11 1 115
11 2 90
11 2 89
22 1 80
22 1 95
22 2 90
22 2 90
22 2 95
26 1 65
33 1 95
33 1 95
;
run;
for each visit, we take multiple measurement of the patient. we need to find the average of these measurements for each visit.
I run into problem trying to get the first or last visit for the same idno. so the expected output is:
11 1 115
11 2 89.5
22 1 88.3
etc...
There will be many many ways to do it. The least mind-twisting method (may not be the fastest) is SQL:
proc sql;
select id_no, visit, avg(measurement) as avg_m from have group by id_no, visit;quit;
Haikuo
There will be many many ways to do it. The least mind-twisting method (may not be the fastest) is SQL:
proc sql;
select id_no, visit, avg(measurement) as avg_m from have group by id_no, visit;quit;
Haikuo
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