Hi,
I would like to retain the AETOXGR variable as AETOXGR_base untill AETOXGR is greater than the previous AETOXGR_base. The problem is that the AETOXGR_base should not change even if the previous AETOXGR was higher, but not higher than another previous AETOXGR. The data should be sorted by SubjectKey and startdate.
Example:
DATA have:
__SUBJECTKEY | STARTDATE | AETOXGR |
1 | 01/Jan/23 | 1 |
1 | 02/Jan/23 | 2 |
1 | 03/Jan/23 | 1 |
1 | 04/Jan/23 | 3 |
1 | 05/Jan/23 | 1 |
1 | 06/Jan/23 | 2 |
DATA want:
__SUBJECTKEY | STARTDATE | AETOXGR | AETOXGR_base |
1 | 01/Jan/23 | 1 | 1 |
1 | 02/Jan/23 | 2 | 2 |
1 | 03/Jan/23 | 1 | 2 |
1 | 04/Jan/23 | 3 | 3 |
1 | 05/Jan/23 | 1 | 3 |
1 | 06/Jan/23 | 2 | 3 |
retain AETOXGR_base .;
AETOXGR_base = max(AETOXGR_base, AETOXGR);
Use a RETAIN statement.
data want;
set have;
by subjectkey startdate;
retain aetoxgr_max ;
if first.subjectkey then aetoxgr_max =.;
aetoxgr_max =max(aetoxgr_max,aetoxgr);
run;
Isn't it amazing that when the question is about retaining a value that SAS has a Retain statement to address that need? 👍
Perhaps a note that this is not available in Proc SQL is appropriate just in case someone tries it with that approach.
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 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.
Select SAS Training centers are offering in-person courses. View upcoming courses for: