I have longitudinal data similar to below:
ID GROUP DATE FLAG
1 A 1/1/2020 1
1 A 1/2/2020 1
1 B 1/3/2020
2 A 1/1/2020
2 A 1/8/2020
2 B 1/4/2020 1
2 B 1/1/2020 1
I want to flag and and further remove observations for the same ID and GROUP where the dates are within 6 days of each other (plus or minus). How may I do this?
HI @Melk Do you mean the following by any chance?
data have;
input ID GROUP $ DATE :mmddyy10.;* FLAG;
format date mmddyy10.;
cards;
1 A 1/1/2020 1
1 A 1/2/2020 1
1 B 1/3/2020
2 A 1/1/2020
2 A 1/8/2020
2 B 1/4/2020 1
2 B 1/1/2020 1
;
data want;
merge have have(firstobs=2 rename=(date=_date group=_group));
if lag(id)=id and lag(group)=group and abs(dif(date))<=6 then Flag=1;
else if group=_group and 0<abs(_date-date)<=6 then Flag=1;
drop _:;
run;
proc print noobs;run;
ID | GROUP | DATE | Flag |
---|---|---|---|
1 | A | 01/01/2020 | 1 |
1 | A | 01/02/2020 | 1 |
2 | B | 01/03/2020 | . |
2 | A | 01/01/2020 | . |
2 | A | 01/08/2020 | . |
2 | B | 01/04/2020 | 1 |
2 | B | 01/01/2020 | 1 |
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