topic Re: finding observations in the month before a specific date in SAS Programming

finding observations in the month before a specific date

lillymaginta — Tue, 18 Oct 2016 17:20:42 GMT

I am trying to summarize observations that occur in the month prior to specific date and create another summary to observations that occurred two months before the same date and so on.

id proc_date  proc_type   hosp_date 
1     11/13/2005   a              12/1/2005
1      10/13/2005  a              12/1/2005 
2       2/3/2004     b               3/1/2004
2       1/14/2004   c                3/1/2004

each id has one hosp_day but multiple proc_date.

The output I am looking is

during 1 months pre hosp_date would include;

id proc_date  proc_type   hosp_date 
1     11/13/2005   a              12/1/2005
2       2/3/2004     b               3/1/2004

during the 2 months pre hosp_dae would include:

id proc_date  proc_type   hosp_date 
1      10/13/2005  a              12/1/2005 
2       1/14/2004   c                3/1/2004

Re: finding observations in the month before a specific date

PGStats — Tue, 18 Oct 2016 18:26:12 GMT

Use function INTCK with option "CONTINUOUS" to get the number of months :

data want;
set have;
months = intck("MONTH", proc_date, hosp_date, "CONTINUOUS");
run;

proc sort data=want; by months id proc_date; run;

proc print data=want; 
by months; id months;
var id proc_date  proc_type   hosp_date;
run;

Re: finding observations in the month before a specific date

lillymaginta — Tue, 18 Oct 2016 20:56:45 GMT

Thank you!