topic Re: Finding whether a date occurred within an interval in SAS Programming

Finding whether a date occurred within an interval

lillymaginta — Wed, 23 Jan 2019 16:03:57 GMT

I am trying to find to retain the value of 1 if a specific date (dg_date) occurred within an interval and 0 otherwise. The interval start and end date are presented with the variables, start and end.

data a;
  input patientid  dg_date : mmddyy10. start : mmddyy10. send : mmddyy10. ;
  format  dg_date start end  mmddyy10.;
datalines;1 5/5/2009  1/1/2006 2/2/2006
1 5/5/2009  2/2/2007 3/2/2007
1 5/5/2009  5/1/2009 6/1/2009
1 5/5/2009  7/7/2009 12/1/2009 
2  1/2/2007 1/2/2006 12/2/2006
2  1/2/2007 12/31/2006 5/5/2007
2 1/2/2007 6/6/2007 7/7/2007;
run;

Output patientid outcome 1 0 1 0 1 1 1 0 2 0 2 1 2 0

Re: Finding whether a date occurred within an interval

Reeza — Wed, 23 Jan 2019 16:05:35 GMT

data want;
set a;

if start < dg_date < send then flag=1;
else flag=0;

run;

@lillymaginta wrote:

I am trying to find to retain the value of 1 if a specific date (dg_date) occurred within an interval and 0 otherwise. The interval start and end date are presented with the variables, start and end.
data a;
  input patientid  dg_date : mmddyy10. start : mmddyy10. send : mmddyy10. ;
  format  dg_date start end  mmddyy10.;
datalines;1 5/5/2009  1/1/2006 2/2/2006
1 5/5/2009  2/2/2007 3/2/2007
1 5/5/2009  5/1/2009 6/1/2009
1 5/5/2009  7/7/2009 12/1/2009 
2  1/2/2007 1/2/2006 12/2/2006
2  1/2/2007 12/31/2006 5/5/2007
2 1/2/2007 6/6/2007 7/7/2007;
run;
Output patientid outcome 1 0 1 0 1 1 1 0 2 0 2 1 2 0

Re: Finding whether a date occurred within an interval

LinusH — Wed, 23 Jan 2019 16:07:33 GMT

I just an IF that tries the interval?
start <= dg_date <= end

Re: Finding whether a date occurred within an interval

lillymaginta — Wed, 23 Jan 2019 16:12:25 GMT

Thank you for the prompt response!