x1=[7 1 11 11 7 11 3 1 2 21 1 11 10] ;
x2=[26 29 56 31 52 55 71 31 54 47 40 66 68];
x3=[ 6 15 8 8 6 9 17 22 18 4 23 9 8];
x4= [60 52 20 47 33 22 6 44 22 26 34 12 12];
y=[78.5 74.3 104.3 87.6 95.9 109.2 102.7 72.5 93.1 115.9 83.8 113.3
109.4];
x11=x1';
x22=x2';
x33=x3';
x44=x4';
y=y';
x=cat(2,x11,x22,x33,x44);
stepwise(x,y,1,0.10,0.15)
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