I have a exposure date and start of adverse events date. I want to find the last exposure or same day exposure for each adverse event date.
Exposure date data
Subj exposure_date
A 2015-09-10
A 2015-10-01
A 2015-11-12
A 2015-11-25
Adverse event date data
Subj adverse_event_date
A 2015-09-23
A 2015-09-23
A 2015-10-16
A 2015-10-16
A 2015-11-05
A 2015-11-05
Desired data set
Subj Last_exposure_date
A 2015-09-10
A 2015-09-10
A 2015-10-01
A 2015-10-01
A 2015-10-01
A 2015-10-01
Hi,
Well, not typing test data in so this is an untested shell:
proc sql; select AE.*, (select max(EXPOSURE_DATE) from EX where SUBJ=AE.SUBJ and EXPOSURE_DATE <= AE.ADVERSE EVENT_DATE) as EXPOSURE_DATE from AE AE; quit;
Hi,
Well, not typing test data in so this is an untested shell:
proc sql; select AE.*, (select max(EXPOSURE_DATE) from EX where SUBJ=AE.SUBJ and EXPOSURE_DATE <= AE.ADVERSE EVENT_DATE) as EXPOSURE_DATE from AE AE; quit;
@RW9 I have one more question. If EX data set has one more variable, how can I add it to resulting data set? I tried to put it as the separate subquery as you did, it is not working.
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