Supposed my dataset like this:
obs x
1 5
2 6
3 9
4 8
5 6
6 7
I want to replace the first obs with the sum of the first and the second (5 replayed by 5+6=11) and the third with the sum of the third and fourth (9 replace by 9+8=17) , etc.
The resulting dataset like this:
obs x
1 11
2 6
3 17
4 8
5 13
6 7
What is the best way to do that?
Thanks!
Andrew
Strange but simple request... Here goes:
data have;
input obs x;
datalines;
1 5
2 6
3 9
4 8
5 6
6 7
;
data want;
if not end then set have(firstobs=2 rename=x=y) end=end;
set have;
if mod(_n_, 2) = 1 then x = x+y;
keep obs x;
run;
PG
Why is the second and 4th left alone?
Because I want them to be there.
Well if the logic is in your head then I guess you'll have to hard code it. Seems kinda pointless then.
Strange but simple request... Here goes:
data have;
input obs x;
datalines;
1 5
2 6
3 9
4 8
5 6
6 7
;
data want;
if not end then set have(firstobs=2 rename=x=y) end=end;
set have;
if mod(_n_, 2) = 1 then x = x+y;
keep obs x;
run;
PG
Straightforward and beautiful! Thanks PG!
Another way to do it.
data want;
set have;
if mod(_n_,2) then flag+1;
run;
proc sql;
select obs,case when obs=min(obs) then sum(x) else x end as x from want
group by flag
order by obs;
quit;
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