data task;
input id date date9. visit;
cards;
101 01jan2015 1
101 02jan2015 2
101 06jan2015 3
102 04jan2015 1
102 07jan2015 2
102 12jan2015 3
103 06jan2015 1
103 13jan2015 2
;
run;
write a program to find out missing dates between visits by each subject.
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data task;
input id date date9. visit ;
cards;
101 01jan2015 1
101 02jan2015 2
101 06jan2015 3
102 04jan2015 1
102 07jan2015 2
102 12jan2015 3
103 06jan2015 1
103 13jan2015 2
;
run;
Answer
data task1;
set task;
by id;
date1=lag(date);
if first.id ne 1 then x=date-date1;
run;
proc print; run;
proc transpose data = task out = b;
var date;
by id;
run;
data new;
set b;
x=col2-col1;
y=col3-col2;
run;
proc print; run;
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