Thanks, Ellison. Another question is if this p-value is a good parameter to
test if the fitting is good, as you this test is only for the null that the
coefficient is 0 (a is 0 in y=exp(a*x), right?)?


On Thu, Feb 7, 2013 at 10:48 AM, S Ellison <S.Ellison@lgcgroup.com> wrote:

>
>
> > After applying the NLS for a model like y=exp(a*x), and I get
> > a result showing the summary as:
> > Estimate Std. Error t value Pr(>|t|)
> > 2.6720     1.4758   1.811   0.3212
> >
> > My question is what this t-statistics tests? And what's the
> > meaning of Pr?
> t is (estimate/std.err) and can be used to test the null that the
> coefficient is 0.
> Pr is the corresponding p-value; the fact that it says "> |t|" indicates
> the number of tails.
>
> S
>
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