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slin
2008 Feb 26
0
NLS -- multiplicative errors and group comparison
...719 obs. of 5 variables:
$ age: num 1.27 2.25 2.25 2.25 2.25 ...
$ tl : num 226 208 226 226 234 ...
$ sex: Factor w/ 2 levels "female","male": 1 1 1 1 1 1 1 1 1 1 ...
$ Gf : num 1 1 1 1 1 1 1 1 1 1 ...
$ Gm : num 0 0 0 0 0 0 0 0 0 0 ...
# starting values
> sLinf <- 405
> sK <- 0.11
> sto <- -5.2
> svb <- list(Linf=sLinf,K=sK,to=sto)
# Fit the additive error structure model to both groups combined
> vbla <- nls(tl~Linf*(1-exp(-K*(age-to))),start=svb,data=fwd)
> summary(vbl1)
Formula: tl ~ Linf * (1 - exp(-K * (age...