topic look back period: SQL code? in SAS Programming

look back period: SQL code?

moreilly — Fri, 31 Mar 2017 17:55:01 GMT

All-

I am trying to figure out the most efficient way to code for a "clean period," or a 6 month time period in which x=0.

there are three variables of interest for each observation

trigger date

claim date

x= 0 or 1

I'd like to make a new variable that flags the observation if x =1 and the time interval between the trigger date and the claim date is 6 months or less. INTCK doesn't seem appropriate because neither date is standardized. someone mentioned that PROC SQL "date matching" may be the right function, but I can't find syntax for that. any ideas?

Thank you!

Re: look back period: SQL code?

LinusH — Fri, 31 Mar 2017 18:06:42 GMT

If you supply sample input and desired output data it would help to visualize your problem.

Re: look back period: SQL code?

moreilly — Fri, 31 Mar 2017 18:55:13 GMT

input:

trigger-date claim_date back_pn

1/13/13 2/13/12 1

1/13/13 4/20/12 0

1/13/13 7/25/12 0

1/13/13 10/15/12 1

2/18/13 8/19/12 0

2/18/13 9/8/12 1

3/12/13 11/30/12 1

3/12/13 12/13/12 1

3/12/13 12/28/12 1

output

trigger-date claim_date back_pn back_pn_6_mo_event

1/13/13 2/13/12 1 0

1/13/13 4/20/12 0 0

1/13/13 7/25/12 0 0

1/13/13 0/15/12 1 1

2/18/13 8/19/12 0 0

2/18/13 9/8/12 1 1

3/12/13 11/30/12 1 1

3/12/13 12/13/12 1 1

3/12/13 2/28/12 1 1

Re: look back period: SQL code?

PGStats — Fri, 31 Mar 2017 19:54:14 GMT

I don't know what you mean by standardized date. If your dates are SAS dates, this would work:


data want;
set have;
back_pn_6_mo_event = 
    back_pn and 
    intck("MONTH", claim_date, trigger_date, "CONTINUOUS") <= 6 ;
run;

If your dates are not SAS dates, then make them so.