fitting growth curves
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
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