Message-ID: <200103290732.JAA15433@luc.ac.be>
Date: 2001-03-29T07:32:45Z
From: Jim Lindsey
Subject: fitting growth curves
In-Reply-To: <3AC21951.5EE4A7C6@bignet.com.br> from "Antonio Olinto" at Mar 28, 2001 02:03:13 PM
>
> Dear R-list members,
>
> Cynthia M. Jones wrote a paper (Fitting growth curves to retrospective
> size-at-age data, Fisheries Research 46(2000):123-129; abstract at
> http://www.elsevier.nl/gej-ng/10/19/44/70/24/37/abstract.html)where the
> SAS procedure MIXED, Macro NLINMIX (Littell et. al., 1996)was used to
> estimate the von Bertalanffy growth function parameters assuming that
> data from the same fish are repeated-measures with autoregressive
> correlation structure and fitting with a nonlinear repeated-measures
> model.
>
> Is there any similar procedure that I can use in R?
elliptic in my growth library will do this even if the times are
unequally spaced. (Unless it changed recently, nlme gives incorrect
answers for the AR in this case.)
Jim
>
> Thanks,
>
> Antonio Olinto
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