model-fitting

Is there any tool for regression model?

I need to derive the linear/Quadratic equation from the set of examples. Is there any tool available? ...

finding the best trade-off point on a curve

Say I had some data, for which I want to fit a parametrized model over it. My goal is to find the best value for this model parameter. I'm doing model selection using a AIC/BIC/MDL type of criterion which rewards models with low error but also penalizes models with high complexity (we're seeking the simplest yet most convincing explanat...

Initial guess visualizing with the nls function

I'm trying to fit a function consisting of several gauss bells to some experimental data. The method used is the nls function from R. But it is difficult to get the initial guess good enough, such that the method can converge. Is it possible to visualize the initial guess BEFORE the optimization routine is called? The code I'm working ...