I am hoping to create a rolling counter but im struggling with a do loop. The counter needs to count the number or records in a rolling 4 hour period by account. I've included a sample of data and the expected counter output. Appreciate the help
Combine date and time variables into datetime variable called dt and run:
data want(keep=account dt counter);
array d {12}; /* Adjust limit to max number of obs per 4-hour window */
pos = 0;
do until(last.account);
set have; by account;
counter = 1;
do i = 1 to dim(d);
if dt - '04:00:00't >= d{i} then call missing(d{i});
else counter = counter + 1;
end;
output;
d{pos + 1} = dt;
pos = mod(pos + 1, dim(d));
end;
run;
Like the @PGStats response, this uses an array to hold time values. However, the array dimension should be set to the largest expected number of records for a single date:
data have;
input account date :$6. time :time5.0 expected;
format time time5.0;
datalines;
1 1-Aug 1:00 1
1 1-Aug 1:30 2
1 1-Aug 2:00 3
1 1-Aug 3:30 4
1 1-Aug 4:30 5
1 1-Aug 5:00 5
1 1-Aug 6:30 4
1 1-Aug 7:30 5
2 1-Aug 13:00 1
2 1-Aug 14:00 2
2 2-Aug 15:00 1
2 2-Aug 16:00 2
run;
data want (drop=_:);
array tims {20} _temporary_;
set have;
by account date;
if first.date then call missing(_n1,counter,of tims{*});
_n1+1;
tims{_n1}=time;
counter+1;
if first.date then _n2=1;
do counter=counter by -1 while (tims{_n2} <= time-'04:00:00't);
tims{_n2}=.;
_n2+1;
end;
run;
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