Nonlinear regression - parameter estimation and fitting models

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Nonlinear regression - parameter estimation and fitting models

I have two data sets - one looks like it approximates a two parameter simple exponent (y=ab^x) and the other like it is a logistic growth curve. How can I:  1) Use SAS to estimate the parameters of the curves; 2) test the fit of the curves to the data. Thanks.

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Re: Nonlinear regression - parameter estimation and fitting models

1) PROC NLIN

2) "test the fit of the curves to the data" -- there is no such test; you can quantify how close the data is to the fitted line (something like a Mean Square Error or Root Mean Square Error)

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