[R] Estimating Weibull Distribution Parameters - very basic question

[David Scott]

On Tue, 28 Aug 2001, Kaspar Pflugshaupt wrote:

>
> Guess I'll have to dig deeper into optim() (never used it before, so the
> possibility didn't occur to me)
>

optim is a fine piece of work. I have used it for fitting a whole range of
different distributions. I didn't even bother with giving derivatives and
it only fell over trying to fit hyperbolic distributions which are
notoriously difficult to fit. Having a range of different optimising
algorithms in one command is great.

Using optim helps me suppress agonizing memories of trying to use NAG
and IMSL. I don't see an attribution for it on ?optim. Whoever put it
together, take a bow.

David Scott
_________________________________________________________________
David Scott     Department of Statistics
                Tamaki Campus
                The University of Auckland, PB 92019
                Auckland        NEW ZEALAND
Phone: +64 9 373 7599 ext 6830     Fax: +64 9 373 7000
Email:  d.scott at Auckland.ac.nz

President, New Zealand Statistical Association

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