Dear colleagues,
 
I wan to to adjust the  Von Bertalanffy model TL=
Linf*(1-exp(-K*(AGE-t0))  to  is fish length (TL) and age (AGE)  . Linf,
K and t0 are parameters of the model. 
The growth of the species I have been working seems to differ between
sexes
I would like to know how to get simultaneous ML estimates:
i) of the three parameters discriminated by sex;
ii) of a common parameter and the two other discriminated by sex.
 using the overall data set which includes a factor variable with two
levels
 Regards,
Ivone Figueiredo 

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