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Nonlinear Regression model


Hello

I have a question about the 

NonlinearRegress[Data, Model, Variables,Parameters] 

function in Mathematica. 

The function is supoosed to find parameters, for given Model, which
best fit the submitted data set.

Can the *model* itself be of a *numerical* nature? In other words, can
the model be smth like

Model[xstart_,theta1_,theta2_]=Findroot[function[x,theta1,theta2]==0,{x,start}]

It seems that this does not work, although it should(?) if one
supplies the Parameters to NonlinearRegress in the form
{theta1,{thetastart1, thetastart2}}, so that no symbolic derivatives
are looked for.

Thanks

AIR


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