sum of a column in separate variable

[Jazzman]

Hello, what's the best way to insert the sum of a column in each row of a separate variable?

Consider a data set

DATA data1;
INPUT var1;
DATALINES;
1
2
3;
RUN;

I would like to generate a new variable var2 in that dataset that has the value 6 in each row.

I know that I can calculate the sum with PROC MEANS, then extract the value with CALL SYMPUT in another data step and then insert the value in a second data step. I could also think of some SQL join to insert the value but since this is a rather standard procedure I guess that there's an easy way and I just can't come up with it.

[Kurt_Bremser · Accepted solution]

Use the "auto remerge" feature of SAS SQL:

proc sql;
create table want as
select
  var1,
  sum(var1) as sum
from have1;
quit;

[PeterClemmensen]

Here is a pure data step approach

DATA data1;
INPUT var1;
DATALINES;
1
2
3
;

data want;
    do until (lr1);
        set data1 end=lr1;
        sum+var1;
    end;
    do until (lr2);
        set data1 end=lr2;
        output;
    end;
run;