Hi,
I am trying to create a study day variable for patients that have multiple encounters per day.
For example:
ID Date Study Day (want to create this)
12 6/20/14 1
12 6/20/14 1
12 6/20/14 1
12 6/20/14 1
12 6/22/14 2
12 6/26/14 3
13 6/20/14 1
Any thoughts?
Thanks!
Hi, perhaps you could try this?
data have;
input ID DATE MMDDYY10.;
datalines;
12 6/20/14
12 6/20/14
12 6/20/14
12 6/20/14
12 6/22/14
12 6/26/14
13 6/20/14
;
run;
proc sort data=have; by ID Date; run;
data want;
set have;
by ID Date;
if first.id then studyday=.;
if not missing(date) then do;
if date ne lag(date) then studyday+1;
end;
run;
proc print noobs; format date ddmmyy10.; run;
Hi, perhaps you could try this?
data have;
input ID DATE MMDDYY10.;
datalines;
12 6/20/14
12 6/20/14
12 6/20/14
12 6/20/14
12 6/22/14
12 6/26/14
13 6/20/14
;
run;
proc sort data=have; by ID Date; run;
data want;
set have;
by ID Date;
if first.id then studyday=.;
if not missing(date) then do;
if date ne lag(date) then studyday+1;
end;
run;
proc print noobs; format date ddmmyy10.; run;
Data want;
set have;
by id date;
retain studyday;
if first.id the studyday=0;
if first.date then studyday+1;
run;
Thank you both so much! The solutions worked perfectly!
Available on demand!
Missed SAS Innovate Las Vegas? Watch all the action for free! View the keynotes, general sessions and 22 breakouts on demand.
Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
Find more tutorials on the SAS Users YouTube channel.
Select SAS Training centers are offering in-person courses. View upcoming courses for: