[R] optim() credentials {was "Estimating Weibull .."}

[Martin Maechler]

>>>>> "DScottNZ" == David Scott <d.scott at auckland.ac.nz> writes:

      ........

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

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

Most if not all of it is by Prof Brian Ripley.

Martin
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