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...2*B^2 ... ) Is there a way to assess the contribution of each term (z1*A, z3*A*B^3 etc) to the accuracy of the regression model? Thanks a lot -- View this message in context: http://r.789695.n4.nabble.com/Effect-of-each-term-in-the-accuracy-of-Nonlinear-multivariate-regression-fitting-equation-tp4650949.html Sent from the R help mailing list archive at Nabble.com.