[R] nonlinear least square fit of a known function

[Douglas Bates]

John Fox <jfox at mcmaster.ca> writes:

> Dear Andy and Dave,
> 
> The nls documentation indicates that weights aren't (yet) implemented.
> 
> Regards,
>   John

But there is an example in the documentation, contributed by Martin
Maechler, showing how to do weighted nonlinear least squares.
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