顶顶顶

加油啊

data ex;
do i=1 to 100;
        x1=ranuni(0);
        x2=ranuni(0);
        x3=ranuni(0);
        y=1*x1+0.5*x2+0.4*x3+rannor(0);
        output;
end;
drop i;
run;


proc reg data=ex;
model y=x1 x2 x3;
run;


proc qlim data=ex;
model y=x1 x2 x3 ;
restrict x1+x2+x3<=1;
run;

请问，Y=1X1+0.5X2+0..4X3+rannor（0）这三个系数是怎么得来的呢？谢谢！

只是模拟一批数据做线性回归