Slight correction:




On Thu, Sep 5, 2013 at 7:48 AM, Bert Gunter <bgunter@gene.com> wrote:

> Michael:
>
> Your parameter specification is probably over-determined, so that you have
> an infinite set of parameter **values** that give essentially the same
> solution within numerical error. I would venture to guess that this will
> not be fixable with alternative optimizers. It is up to you to provide a
> sensible problem specification; failure to do so cannot be blamed on the
> optimizer.
>
> Cheers,
> Bert
>
>
> On Thu, Sep 5, 2013 at 3:23 AM, Michael Meyer <spyqqqdia@yahoo.com> wrote:
>
>> Thanks for all replies.
>> The problem occurred in the following context:
>>
>> A Gaussian one dimensional mixture (number of constituents, locations,
>> variances all unknown)
>> is to be fitted to data (as starting value to or in lieu of mixtools). A
>> likelihood maximization is performed.
>>
>> I'll try to destill the code so that reproducible failure of L-BFGS-B
>> occurs
>> and post it here.
>>
>>
>>
>> Michael Meyer
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> --
>
> Bert Gunter
> Genentech Nonclinical Biostatistics
>
> Internal Contact Info:
> Phone: 467-7374
> Website:
>
> http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
>
>



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

	[[alternative HTML version deleted]]

