update
data hw521;
input x1 x2 x3 x4 y1;
x12=x1*x1; x1x2=x1*x2; x1x3=x1*x3; x1x4=x1*x4;
x22=x2*x2; x2x3=x2*x3; x2x4=x2*x4;
x32=x3*x3; x3x4=x3*x4;
x42=x4*x4;
datalines;
1 1 1 1 86.3
...
;
proc glm;
class x1 x2 x3 x4;
model y1=x1 x2 x3 x4 x12 x1x2 x1x3 x1x4 x22 x2x3 x2x4 x32 x3x4 x42;
run;


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