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

Martin Maechler maechler at stat.math.ethz.ch
Wed Aug 29 08:38:07 CEST 2001


>>>>> "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
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._



More information about the R-help mailing list