?? examp9_20.m
字號(hào):
a=[1 -1.232 2.23 2 4,3.792]'; X=randn(120,6); y=X*a; a1=inv(X'*X)*X'*y
[a,aint]=regress(y,X,0.02)
yhat=y+sqrt(0.5)*randn(120,1); [a,aint]=regress(yhat,X,0.02)
yhat=y+sqrt(0.1)*randn(120,1); [a,aint]=regress(yhat,X,0.02);
errorbar(1:6,a,aint(:,1)-a,aint(:,2)-a)
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