[Gretl-users] Overview of nls

[Ryan J. Pieszak]

Greetings all,
 
In the documentation shown below (from the gretl-guide.pdf), are the regression functions being passed in standard functions?  How would I know what function to pass in?  My assumption was that I could just pass in the data sets and gretl would give back the parameters used to build the function.
 
nls C = alpha + beta * Y^gamma
nls y = alpha + beta * x1 + (1/beta) * x2
 
Also, it says that if the nonlinear function is a generalization of a linear model, running the ols and passing it's coefficient estimates in as the intial parameters would be more accurate.  How do I know if the nonlinear function is a generalization of a linear model?
 
I don't really understand how to use the nls, and the documentation makes some assumptions on the user's level of knowledge.
Any help would be greatly appreciated.
Thanks,
Ryan
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