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yourglmmodel
2010 Apr 16
2
piecewise nls?
I am looking into fitting a so-called double von Bertalanffy function to fish length-at-age data. Attempting to simplify the situation, the model looks like this ...
Y ~ f(X; a,b,c) if x < Z
Y ~ g(X; a,d,e) if x >= Z
where
* f and g are non-linear functions (the "traditional" "single" von Bertalanffy growth function),
* Y (length) and X (age) are observed variables,