I have this data set and I want to create a count variable for number of time in hospital;
Id date
001 01/07/17
001 03/07/17
002 01/07/17
003 02/01/17
003 04/05/17
004 05/05/17
;
I want to create a third variable number of visit such that the data becomes;
Id date number_visit
001 01/07/17 1
001 03/07/17 2
002 01/07/17 1
003 02/01/17 1
003 04/05/17 2
004 05/05/17 1
best.
See the solution here to create a counter variable:
http://stats.idre.ucla.edu/sas/faq/how-can-i-create-an-enumeration-variable-by-groups/
See the solution here to create a counter variable:
http://stats.idre.ucla.edu/sas/faq/how-can-i-create-an-enumeration-variable-by-groups/
alternatively, you could also try the proc sql monotonic()
proc sql;
create table want as select *, (monotonic()-min(monotonic())+1) as number_visit from have group by id;
quit;
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