I obtained the following when I ran that code for fun:

Parse error at unexpected token 'params'

Error executing script: halting
> params a

Clive

On 25 September 2015 at 16:42, Allin Cottrell <cottrell@wfu.edu> wrote:
On Fri, 25 Sep 2015, Allin Cottrell wrote:

Interestingly enough, the example given on the NIST website http://www.itl.nist.gov/div898/handbook/pmc/section4/pmc431.htm has a local SSE minimum at about a = -0.12 and a global minimum at about 1.68, with nothing resembling a minimum in the "legitimate" range. (Although they talk about applying the Marquardt procedure they don't mention the result!)

 In case it's of interest to anyone, I'm attaching a script to replicate the NIST example and show the alpha/MSE relationship.

Allin
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--
Clive Nicholas

"My colleagues in the social sciences talk a great deal about methodology. I prefer to call it style." -- Freeman J. Dyson