[ADMB Users] Future of R project article

Mark Maunder mmaunder at iattc.org
Wed Jun 16 16:33:41 PDT 2010

This might be interesting for some of you

Mark Maunder 
Head of the Stock Assessment Program
Inter-American  Tropical Tuna Commission
8604 La Jolla Shores Drive
La Jolla, CA, 92037-1508, USA
Tel: (858) 546-7027
Fax: (858) 546-7133
mmaunder at iattc.org
Visit the AD Model Builder project at
See the following website for information on fisheries stock assessment

-----Original Message-----
From: users-bounces at admb-project.org
[mailto:users-bounces at admb-project.org] On Behalf Of Arni Magnusson
Sent: Wednesday, June 16, 2010 1:40 PM
To: r-help at r-project.org
Cc: users at admb-project.org
Subject: Re: [ADMB Users] an alternative to R for nonlinear stat models

It has been brought to my attention that the 1997 benchmark was updated
2006, using R instead of S-Plus. and a newer computer, obviously.

The result was that ADMB converged more than 1000 times faster than R.

The model is an ecological population model, not unlike Gove et al. 
(2002). Anyone should be able to replicate the results, since the
http://admb-project.org/community/benchmarks/optimization page has links

to the ADMB code, R code, and the input data. The 2006 benchmark used
R optimizer nlminb(), so there are many other R optimizers that could be

benchmarked today.

Any improvements are of course welcomed, although the current discussion

may be focusing on the similar Gove et al. (2002) example.

I should also correct what I said about ADMB doing "optimization and 
nothing else", since ADMB features like random effects and MCMC are
the standard features of optimizers.

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