[R] anova() for nlm or nls

[Roland Regoes]

Dear R community,

I am currently fitting non-linear models using nlm and nls.

1) I would like to compare the different models analogous to the
comparison of linear models with anova(). Is there a function in R which
allows to do that?

2) I would like to constrain the parameter ranges to positive values
only. Is there an option in nlm or nls which allows to constrain
parameter ranges? (So far I constrained them "manually" by incorporating
the constraints into the definition of the functions fitted.)

Thanks for your help,

Roland


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Roland Regoes
Department of Biology
Emory University
1510 Clifton Rd
Atlanta, GA 30322

tel: (404) 727-1765
fax: (404) 727-2880
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