(corrected version of previous posting)

I fit a GAM to turtle growth data following methods in Limpus & Chaloupka
1997 (http://www.int-res.com/articles/meps/149/m149p023.pdf).

I want to obtain figures similar to Fig 3 c & f in Limpus & Chaloupka
(1997), which according to the figure legend are "expected size-at-age
functions" obtained by numerically integrating "size-specific growth rate
functions derived using cubic B-spline fit to GAM predicted values".

I was able to fit the cubic-B spline, but I do not know how to "numerically
integrate" it.

Can anybody help please?

Code and figures here:
https://docs.google.com/fileview?id=0B1cQ7z9xYFl2ZTZhMmMyMjAtYTA3Zi00N2QyLTkxNzMtOGYyMjdiOGU2ZWE4&hl=en

Thank you,
Claudia

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