proc
reg
data=elec outest=out2 graphics outvif;
model y=z1-z2/ridge=0.0 to 0.1 by 0.01
0.2
0.3
0.4
0.5;
plot/ridgeplot;
proc
print
data=out2;
run;
proc
reg
data=elec outest=out3 graphics outvif;
model y=x1 x2/ridge=0.1;
proc
print
data=out3;
run;


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