[R] Problem with NLSYSTEMFIT()

From: Kilian Plank <kilian.plank_at_m-lehrstuhl.de>
Date: Fri 13 Jan 2006 - 00:20:56 EST


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()" ?  

Kind regards,  

Kilian Plank

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