Dear Kilian, On Thursday 12 January 2006 14:20, Kilian Plank wrote: > Hello, > > > > I want to solve a nonlinear 3SLS problem with "nlsystemfit()". The > equations > > are of the form > > y_it = f_i(x,t,theta) > > The functions f_i(.) have to be formulated as R-functions. When invoking > > "nlsystemfit()" I get the error > > > > Error in deriv.formula(eqns[[i]], names(parmnames)) : > > Function 'f1' is not in the derivatives table > > > > Isn't it possible to provide equations in the form > > eq1 ~ f1(x,t,theta) etc. to "nlsystemfit()" ?
Unfortunately, this is not (yet) possible. You have to specify your equations like "eq1 <- y ~ b0 + x1^b1 + b1^2 * log( x2)" (see the documentation of nlsystemfit). Furthermore, I suggest that you ask the author of nlsystemfit (Jeff Hamann, see cc) how reliable the algorithms for the non-linear estimation are in the current version of systemfit (while the code for the linear estimation is very mature now, the non-linear estimation is still under development). You are invited to help us improving the code of nlsystemfit ;-) Best wishes, Arne > Kind regards, > > > > Kilian Plank > > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html -- Arne Henningsen Department of Agricultural Economics University of Kiel Olshausenstr. 40 D-24098 Kiel (Germany) Tel: +49-431-880 4445 Fax: +49-431-880 1397 [EMAIL PROTECTED] http://www.uni-kiel.de/agrarpol/ahenningsen/ ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
