BookmarkSubscribeRSS Feed
☑ This topic is solved. Need further help from the community? Please sign in and ask a new question.
shrutisd0
Fluorite | Level 6

I am trying to create a new variable called "stroke visit" using the information below. I have the date of stroke and visit numbers available. The stroke visit would be closest to the date of stroke (preferably before the latest visit) e.g. for ID 2 the visitnum should be "3".

 

id stroke dateofstrk   visitdate   visitnum

1    0               .          11/1/2022     1

1    0               .          12/1/2022     2

1    0               .          1/1/2023       3

2    1     12/25/2022  11/1/2022      1

2    1     12/25/2022  12/1/2022      2

2    1     12/25/2022  1/1/2023        3

3    1     11/13/2022  11/1/2022      1

3    1     11/13/2022  12/1/2022      2

3    1     11/13/2022  11/1/2023      3

1 ACCEPTED SOLUTION

Accepted Solutions
PGStats
Opal | Level 21

The date of the first visit occuring at or after the date of stroke can be obtained as:

 

data have;
input id stroke (dateOfStrk visitDate) (:mmddyy.) visitNum;
format dateofStrk visitDate yymmdd10.;
datalines;
1    0               .          11/1/2022     1
1    0               .          12/1/2022     2
1    0               .          1/1/2023       3
2    1     12/25/2022  11/1/2022      1
2    1     12/25/2022  12/1/2022      2
2    1     12/25/2022  1/1/2023        3
3    1     11/13/2022  11/1/2022      1
3    1     11/13/2022  12/1/2022      2
3    1     11/13/2022  11/1/2023      3
;

proc sql;
/* create table want as */
select 
    a.*, b.strkVisit format=yymmdd10.
from 
    have as a left join
    (select id, min(visitDate) as strkVisit 
    from have where stroke and visitDate>=dateOfStrk 
    group by id) as b
    on a.id=b.id
    order by id, visitNum;
quit;

PGStats_0-1679417189191.png

 

PG

View solution in original post

1 REPLY 1
PGStats
Opal | Level 21

The date of the first visit occuring at or after the date of stroke can be obtained as:

 

data have;
input id stroke (dateOfStrk visitDate) (:mmddyy.) visitNum;
format dateofStrk visitDate yymmdd10.;
datalines;
1    0               .          11/1/2022     1
1    0               .          12/1/2022     2
1    0               .          1/1/2023       3
2    1     12/25/2022  11/1/2022      1
2    1     12/25/2022  12/1/2022      2
2    1     12/25/2022  1/1/2023        3
3    1     11/13/2022  11/1/2022      1
3    1     11/13/2022  12/1/2022      2
3    1     11/13/2022  11/1/2023      3
;

proc sql;
/* create table want as */
select 
    a.*, b.strkVisit format=yymmdd10.
from 
    have as a left join
    (select id, min(visitDate) as strkVisit 
    from have where stroke and visitDate>=dateOfStrk 
    group by id) as b
    on a.id=b.id
    order by id, visitNum;
quit;

PGStats_0-1679417189191.png

 

PG

sas-innovate-2024.png

 

Time is running out to save with the early bird rate. Register by Friday, March 1 for just $695 - $100 off the standard rate.

 

Check out the agenda and get ready for a jam-packed event featuring workshops, super demos, breakout sessions, roundtables, inspiring keynotes and incredible networking events. 

 

Register now!

How to Concatenate Values

Learn how use the CAT functions in SAS to join values from multiple variables into a single value.

Find more tutorials on the SAS Users YouTube channel.

Click image to register for webinarClick image to register for webinar

Classroom Training Available!

Select SAS Training centers are offering in-person courses. View upcoming courses for:

View all other training opportunities.

Discussion stats
  • 1 reply
  • 193 views
  • 1 like
  • 2 in conversation