> > As an example, alternate theories for chemical diffusivity D are:
> >
> > (1) D=(K)*exp(-Q/T)
> > (2) D=(K/T)*exp(-Q/T)
> > where K and Q are experimentally determined constants and T is
> > temperature.
> >
> > Given a set of (D,T) data the F-test can be used to see if there is a
> > significant difference between these two models.
> >
>
> The F-test is used, by theory and by custom, to test
> models that are *nested*, using the difference in d.f. as
> the numerator degrees of freedom. Here, that d.f. seems
> to be zero....
No, in this case the df for the "partial" model is 1, for the "full"
model is 2, and the additional df is 1. (see Nonlinear regression
analysis and its applications, Bates & Watts, 1988. 3.10.1)
.
.
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