Hi experts,
I need help retaining values in a SAS dataset and completing the column datetime (to the level of seconds) when not existing.
My dataset looks like:
data HAVE;
input type$ DATE:datetime18. value;
format date datetime18.;
cards;
A 19JUN01:21:06:55 534
A 19JUN01:21:06:58 590
A 19JUN01:21:07:02 600
A 19JUN01:21:07:04 602
B 18JUN01:22:06:58 105
B 18JUN01:22:07:03 110
;
run;
I need to fill the missing datetime and repeat the value when needed.
My result dataset should be:
data WANT;
input type$ DATE:datetime18. value;
format date datetime18.;
cards;
A 19JUN01:21:06:55 534
A 19JUN01:21:06:56 534
A 19JUN01:21:06:57 534
A 19JUN01:21:06:58 590
A 19JUN01:21:06:59 590
A 19JUN01:21:07:00 590
A 19JUN01:21:07:01 590
A 19JUN01:21:07:02 600
A 19JUN01:21:07:03 600
A 19JUN01:21:07:04 602
B 18JUN01:22:06:58 105
B 18JUN01:22:06:59 105
B 18JUN01:22:07:00 105
B 18JUN01:22:07:01 105
B 18JUN01:22:07:02 105
B 18JUN01:22:07:03 110
;
run;
Thanks for your suggestions. Regards
You don't have ETS licensed then just use a data step. The tricky part is find the value of the next "date" (actually in this case the next datetime).
data HAVE;
input type $ DATE :datetime. value;
format date datetime19.;
cards;
A 19JUN01:21:06:55 534
A 19JUN01:21:06:58 590
A 19JUN01:21:07:02 600
A 19JUN01:21:07:04 602
B 18JUN01:22:06:58 105
B 18JUN01:22:07:03 110
;
data want;
set have;
by type date;
set have(firstobs=2 keep=date rename=(date=next_date)) have(obs=1 drop=_all_);
if last.type then next_date=.;
else next_date=next_date-1;
do date=date to coalesce(next_date,date);
output;
end;
drop next_date;
run;
Result
data HAVE;
input type$ DATE:datetime18. value;
format date datetime18.;
cards;
A 19JUN01:21:06:55 534
A 19JUN01:21:06:58 590
A 19JUN01:21:07:02 600
A 19JUN01:21:07:04 602
B 18JUN01:22:06:58 105
B 18JUN01:22:07:03 110
;
run;
proc timeseries data=have out=want;
by type;
id date interval = second
setmiss = prev;
var value;
run;
Result:
type DATE value A 19JUN01:21:06:55 534 A 19JUN01:21:06:56 534 A 19JUN01:21:06:57 534 A 19JUN01:21:06:58 590 A 19JUN01:21:06:59 590 A 19JUN01:21:07:00 590 A 19JUN01:21:07:01 590 A 19JUN01:21:07:02 600 A 19JUN01:21:07:03 600 A 19JUN01:21:07:04 602 B 18JUN01:22:06:58 105 B 18JUN01:22:06:59 105 B 18JUN01:22:07:00 105 B 18JUN01:22:07:01 105 B 18JUN01:22:07:02 105 B 18JUN01:22:07:03 110
I did not know that this was a feature of PROC TIMESERIES. Thanks!
Yeah, Proc Timeseries is quite cool for tasks like this 🙂
You don't have ETS licensed then just use a data step. The tricky part is find the value of the next "date" (actually in this case the next datetime).
data HAVE;
input type $ DATE :datetime. value;
format date datetime19.;
cards;
A 19JUN01:21:06:55 534
A 19JUN01:21:06:58 590
A 19JUN01:21:07:02 600
A 19JUN01:21:07:04 602
B 18JUN01:22:06:58 105
B 18JUN01:22:07:03 110
;
data want;
set have;
by type date;
set have(firstobs=2 keep=date rename=(date=next_date)) have(obs=1 drop=_all_);
if last.type then next_date=.;
else next_date=next_date-1;
do date=date to coalesce(next_date,date);
output;
end;
drop next_date;
run;
Result
data HAVE;
input type $ DATE :datetime. value;
format date datetime19.;
cards;
A 19JUN01:21:06:55 534
A 19JUN01:21:06:58 590
A 19JUN01:21:07:02 600
A 19JUN01:21:07:04 602
B 18JUN01:22:06:58 105
B 18JUN01:22:07:03 110
;
data want;
merge have have(keep=type date rename=(type=_type date=_date) firstobs=2);
output;
if type=_type then do;
do date=date+1 to _date-1;
output;
end;
end;
drop _type _date;
run;
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