[R] Piecewise linear regression with RMA

[amsegura at fcien.edu.uy]

Hi,
I'm working in crustacean maturity, using breakpoint analysis.
I used total length and Carapace length (linearly related) to find a break
point, wich is actually the size at maturity. Both sizes are measured with
error, so Modell II aplies.
Piecewise regression uses model I to find breakpoints.
Do anybody nows a way of finding the break point using a model II regression?
Any feedback on this is highly appreciated.

Angel Segura
Instituto de Investigaciones Pesqueras
Facultad de Veterinaria
Montevideo-Uruguay