data aaa;
input y x1 x2 x3;
cards;
2.039414119 2.986055229 -0.42136079 0.638420744
2.010723865 3.030003119 -0.394694954 0.599053286
2.009875634 3.07368903 -0.373659633 0.596678491
2.032215703 3.113557661 -0.343901798 0.683966469
2.0523091 3.156903045 -0.017728767 0.838596599
2.051923916 3.208233835 0.042969073 1.042571356
2.048441804 3.286164671 0.071882007 1.152885071
2.040206628 3.364731054 0.127752516 1.21822944
2.03702788 3.426488163 0.151676231 1.272349046
2.034227261 3.471835706 0.16879202 1.304805786
2.028571253 3.514979309 0.180125875 1.357334293
2.028164419 3.555794441 0.227372442 1.375380405
2.031812271 3.600860988 0.245265839 1.4145055
2.031408464 3.653140994 0.369215857 1.464757957
2.035029282 3.707707426 0.388456453 1.529744007
2.038620162 3.76504736 0.40688067 1.633460562
2.039017322 3.8241063 0.428620673 1.734146612
2.04060234 3.876955457 0.461048092 1.831822206
2.045322979 3.934648509 0.48315921 1.922631596
2.046885191 3.999164048 0.481442629 2.016747981
;
proc robustreg;
model y = x1 x2 x3;
run;
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