Re: leasqr problem - covp is 'NA'!!!

[Dmitri A. Sergatskov]

On Mon, Apr 18, 2011 at 1:22 PM, Przemek Klosowski
<address@hidden> wrote:

> The covariance matrix results in sqrt(diag(covp))) values of 77.468751
>  77.468741    0.061083   90.835584. These values look strange, given the
> goodness of the fit; I haven't dwelved into it but the covp matrix looks
> strange--- approximately
>
> 1000 * [1 -1 0 1; -1 1 0 -1; 0 0 0 0; 1 -1 0 1]
>
> which doesn't make sense to me but I haven't thought about it long enough to
> convince myself one way or the other. Practitioners of leasqr, what do you
> think about the reliability of covp values?
>

I think there are too many fit parameters.
The fit functions essentially a+b*exp(c*x).

Dmitri.
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