[R] fitting growth curves

[Douglas Bates]

Antonio Olinto <aolinto at bignet.com.br> writes:

> 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?

Yes - the nlme function from the library of the same name.

The usage of both lme and nlme is described in
@Book{pinh:bate:2000,
  author =	 {Jos\'{e} C. Pinheiro and Douglas M. Bates},
  title = 	 {Mixed-Effects Models in \textsf{S} and \textsf{S-PLUS}},
  publisher = 	 {Springer},
  year = 	 2000,
  series =	 {Statistics and Computing}
}
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