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Thanks for the reply. I need to fit the model described above to either of the two available sets of data and use the residue to perform a separate set of analyses. The real concern is that I have too many variables to fit and I fear overfitting and hence the resulting (un)reliability and...

I'm trying to create a model which is of the form y = (a0 + a1l)[b0+MΣm=1 bmcos(mx-αm)] [c0 + NΣn=1 cn cos(nz-βn)] In the above system, l,x and z are independent variables and y is the dependent variable. The a, b and c terms are the unknowns. To solve for these unknowns, I have two separate...