SAS中的Excel sumproduct

Question

Table1

Age     B C D E F G H
0-10    5 6 8 9 0 1 1
10-20   4 5 9 7 1 4 5
20-30   5 6 5 4 2 5 8
0-10    0 4 0 5 8 0 7

Table2

Age      A1  B1  C1  D1
0-10     0.1 0.9 0.2 
10-20    0.5 0.6 0.7

I want to extract

SUMPRODUCT(Table1(G:H),Table2(B1:C1))

with condition that IF Table1.Age = Table2.Age .

OUTPUT Table should look like

AGE   SUMPRODUCT
0-10  0.8
10-20 0.70

Answer 1

You need to merge the two datasets together, and then calculate the sum of the products.

data want;
merge table1(in=a) table2(in=b);
by age;
if a and b;
newvar = sum(g*b1, h*c1);
run;

You could do the same thing in a SQL join or a hash table lookup.

Arrays:

data want;
merge table1(in=a) table2(in=b);
by age;
if a and b;
array avars[20] <list of a vars>;
array bvars[20] <list of b vars>;
do _t = 1 to dim(avars);
   newvar = sum(newvar,avars[_t]*bvars[_t]);
end;
run;