options crt;  ? 2e4
in return;
freq m;
smpl 83:1 87:12;
y = delta - rkfree;
x = market - rkfree;
?
olsq x c y;
set d = @coef(1);  set g = @coef(2);
set bx = 1/g;  set ax = -d/g;
print bx ax;  ? (b)
?
olsq y c x;
set ay = @coef(1);  set by = @coef(2);  ? (c)
?
set byg = by*g;
set bxviag = by/@rsq;
print @rsq byg bxviag bx;  ? (d)