A standard nested F-test of linear (f(u,v)~u+v), interaction-only (f(u,v)~u+v+I(u*v)), and full-quadratic (f(u,v)~u+v+I(u^2)+I(u*v)+I(v^2)) models.
an object of class 'siRSM', often result from siRSM
Huan Cheng, Mu Zhu
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