commons-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Sébastien Brisard <sebastien.bris...@m4x.org>
Subject Re: [Math] Question about "AbstractLeastSquaresOptimizer" code
Date Tue, 24 Apr 2012 20:00:57 GMT
I also found this link
mljohnson.pharm.virginia.edu/pdfs/314.pdf
see equations 20 and 3, which suggest c should stay. I must read this
more carefully, though...
Sébastien

Le 24 avril 2012 21:42, Sébastien Brisard <sebastien.brisard@m4x.org> a écrit :
> Ooops, I hit the wrong key... So here is the rest of my previous message...
>
> Hi Gilles,
>>
>> Does anyone object to the estimated error be defined as
>>
>>  errors[i] = FastMath.sqrt(covar[i][i]);
>>
>> ?
>>
>>
>> Best regards,
>> Gilles
>>
> I'm not an expert on parameter estimation, but I'm not sure about the
> removal of the c prefactor in the above expression. See for example
> NR, chapter 15. In particular, equation 15.6.4 might be of interest.
> I also found this thread
> http://www.physicsforums.com/showthread.php?t=47534
> which certainly does not provide a definite answer, but the formula
> suggests that c should stay.
>
> Again, I'm not claiming your suggestion is wrong, I would just like to
> find a reference which clearly states the right answer...
> One way to check the formula would be to test against another
> software. I know that gnuplot provides error estimates on the
> parameters, I'm happy to run it with the data set of your choice.
>
> Best regards,
> Sébastien


---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org
For additional commands, e-mail: dev-help@commons.apache.org


Mime
View raw message