[R-sig-eco] growth curves - grofit

[A.P.B. Carneiro]

Dear all,

I am trying to use grofit package for biological growth curves. I would 
like to see which curves describe best my data and from them predict 
results I don’t have.

I basically have a sample of data containing wing length of some birds 
(as a growth measure) and their respective ages. And I have another 
sample just with wing lengths (not associated with an age). The format 
is a little different than what is specified on the package. What I 
would like to do is:

1)      Find the best curve that describes my data (using the data that 
I have ages),

2)      Apply the results to the data I don’t have ages, and predict 
these ages.


Is it possible with grofit? Any ideas how to do it?

Thanks,

Ana

-- 

PhD student
Evolutionary Ecology Group
Department of Zoology
University of Cambridge