[R] NLS results different from Excel -- Tricky fortunes nomination

Rolf Turner rolf.turner at xtra.co.nz
Wed Feb 20 21:15:31 CET 2013

I think that this nomination is a Good Idea!



On 02/21/2013 06:50 AM, Bert Gunter wrote:
> Folks:
> I thought the following excerpt from Bruce McCullough's post would be
> a good candidate for the R fortunes package -- except that it's about
> Excel, not R!  So I nominate it... but leave it to others to say
> whether it's really "qualified" to be nominated.
> ----
> "The idea that the Excel solver "has a good reputation for being fast
> and accurate" does not withstand an examination  of the Excel solver's
> ability to solve the StRD nls test problems. ...
> Excel solver does have the virtue that it will always produce an
> answer, albeit one with zero accurate digits."
> ---
> I also leave it to others to modify what is excerpted if appropriate.

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