Re: [R] an alternative to R for nonlinear stat models

From: Paul Hiemstra <p.hiemstra_at_geo.uu.nl>
Date: Wed, 16 Jun 2010 09:36:24 +0200

On 06/16/2010 07:35 AM, benedikt.gehr_at_ieu.uzh.ch wrote:
> Hi
> I implemented the age-structure model in Gove et al (2002) in R, which is a
> nonlinear statistical model. However running the model in R was very slow.
> So Dave Fournier suggested to use the AD Model Builder Software package and
> helped me implement the model there.
> ADMB was incredibly fast in running the model:
> While running the model in R took 5-10 minutes, depending on the settings,
> in ADMB it took 1-2 seconds!
> I'm reporting this so that people who have performance issues with nonlinear
> statistical models in R will know that there is a good free alternative for
> more difficult problems.
> There is also a help platfrom equivalent to the one for R, and people
> running it are extremley helpful.
> I hope this might help someone
> cheers
> Beni
> ______________________________________________
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>
Hi Beni,

Thanks for posting information that might be useful for people on the list. The only thing is that without a little more detail on how exactly you implemented things in R, we are left to guess if the performance issues are a problem of R, or that your particular implementation was the problem. There are was of implementing R code in two ways, where the first takes minutes and the second 1-2 seconds. Furthermore, you are giving us no option to defend R ;).

cheers,
Paul

-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:  +3130 274 3113 Mon-Tue
Phone:  +3130 253 5773 Wed-Fri
http://intamap.geo.uu.nl/~paul
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Received on Wed 16 Jun 2010 - 07:41:08 GMT

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