topic Re: Selecting when criteria is met within a smaller time period in SAS Programming

Selecting when criteria is met within a smaller time period

kwokramer — Wed, 10 Sep 2014 13:26:46 GMT

I have data for one year that includes one date variable. There are many rows per individual. I need to be able to select individuals who satisfy three criteria within any 90 day period in the year. The dates are not equally spaced or the same for every individual. Any help would be greatly appreciated. This needs to be able to done in proc sql.

Re: Selecting when criteria is met within a smaller time period

DBailey — Wed, 10 Sep 2014 13:34:37 GMT

off the cuff...

proc sql;

select

t1.individual,

t1.datevar,

count(*) as Occurrences

from

have t1

inner join have t2

on t1.individual = t2.individual

and intck('day',t1.datevar, t2.datevar) <=90

group by t1.individual, t1.datevar

having count(*)>=3;

quit;

Re: Selecting when criteria is met within a smaller time period

Astounding — Wed, 10 Sep 2014 15:38:24 GMT

One pitfall to code around ...

INTCK will return a negative number when the first date is later than the second date. You probably don't want all of those included in your count.

Re: Selecting when criteria is met within a smaller time period

kwokramer — Wed, 10 Sep 2014 15:44:28 GMT

Would sorting after the initial data pull fix that?

Re: Selecting when criteria is met within a smaller time period

DBailey — Wed, 10 Sep 2014 18:25:44 GMT

sorting wouldn't help.

proc sql;

select

t1.individual,

t1.datevar,

count(*) as Occurrences

from

have t1

inner join have t2

on t1.individual = t2.individual

and intck('day',t1.datevar, t2.datevar) <=90

and t2.datevar >= t1.datevar

group by t1.individual, t1.datevar

having count(*)>=3;

quit;