
Hi all,

I'm looking for the algorithm to calculate maximum intrinsic and parameter effects curvature of Bates & Watts (1980). I have Bates & Watts (1980) original article, Bates et al (1983) article, Seber & Wild (1989) and Ratkowsky (1983) books. Those sources show steps and algorithm to get this measures but I don't know translate C code to R language and I've no success until now.

I know and I use rms.curv() in MASS package but I would like the maximum curvatures measures.

Does someone have this implemented in R? Or know some paper illustrating this calculation with real data (but not so trivial) that can able me to create my functions?

Thanks a lot.
Walmes Zeviani.

Bates; Hamilton; Watts. Calculation onf intrinsic and parameter-effects curvatures for nonlinear models. Communications in statistics - simulations and computation, 469-477, 1983.
Bates; Watts. Relative curvature measures of nonlinearity. Journal Royal Statistical Society - B. 40, 1-25, 1980.
Seber; Wild. Nonlinear regression. Wiley, 1989.
Ratkowsky. Nonlinear regression modeling. Marcel Dekker, 1983.
 		 	   		  
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