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proc nlin data=dd method=marquardt;
  parameters  x1=1 x2=1 x3=1 x4=1 z1=1 z2=1 z3=1 z4=1;
  model H=x1*a1*(b1**z1)+x2*a2*(b2**z2)+x3*a3*(b3**z3)+x4*a4*(b4**z4);
run;
quit:

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