Hello forum, I am interested in investigating non-linear relationships between variables using something akin to Multivariate Adaptive Regression Splines. The problem is that my data have sample weights and stratification variables, and I don't think earth and similar packages support these. Any suggestions? It doesn't have to be MARS per se, just something to estimate non-linear relationships that does a better job than polynomials and can incorporate sample weights and stratification variables. Thanks, Jim
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