topic Re: Sum in SAS Procedures

Sum

deleted_user — Thu, 16 Apr 2009 07:16:15 GMT

i have a dataset

data x;
input id tot;
cards;
5 1
6 2
7 .
5 1
6 2
9 .

Now i want a new variable i want the sum of id having 1 and 2

Re: Sum

Andre — Thu, 16 Apr 2009 08:08:54 GMT

This kind of problem looks like homework.

Here is thus an answer but you have to read documentation
about the "retain" statement to understand the first step which is calculating your results

http://support.sas.com/onlinedoc/913/getDoc/fr/lrdict.hlp/a000214163.htm

the second datastep is showing you that the result are in the table on the last observation
but understanding this step is not trivial and need a 'sum' of practice.

Andre

[pre]
data x;
infile cards ;
input id tot; retain one two 0;
if tot=1 then one+id;
if tot=2 then two+id;
cards;
5 1
6 2
7 .
5 1
6 2
9 .
run;
data _null_;
set x nobs=l point=l;
put one= two= ;
stop;
run;
[/pre]

Re: Sum

deleted_user — Thu, 16 Apr 2009 13:49:07 GMT

PROC SQL;
create table y as
select sum(id) as sum_id
from x
where tot =1 or tot = 2;
QUIT;

OR

PROC SQL;
create table y as
select sum(id) as sum_id, tot
from x
where tot =1 or tot = 2
group by tot;
QUIT;