[R-sig-eco] growth curves - grofit

[Romine, Jason]

Hi Ana,

I would simply select the models you think may fit your data, then use nlm
or optim to fit the models.  Once you have selected your final model, use
your data to predict ages from wing lengths.

Best,
Jason


--------------------------------------------------------
Jason G. Romine, Ph.D.
USGS Western Fisheries Research Center
Columbia River Research Laboratory
5501A Cook-Underwood Road
Cook, WA 98605
Phone: (509) 538-2299 x213
Email:jromine at usgs.gov
Website: http://wfrc.usgs.gov
---------------------------------------------------------


On Wed, Aug 13, 2014 at 4:55 AM, A.P.B. Carneiro <apbc2 at cam.ac.uk> wrote:

> 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
>
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