Hi, I have the following problem while running a "gam" regression: test.gam = gam(fmla,data=Final.Df) where fmla is a regression formula that looks like: "Var1 ~ poly(c(1:160), degree = 5) + VarC1 + VarC2 + . VarC12 Within SPlus I used the following phrase to find the coefficients for the poly variables: Poly.Variables = data.frame(poly.transform(poly(c(1:160), degree 5),coef(test.gam)[1:6],T)) Does anyone knows how I can retrieve the coefficients within R? Thx for helping me out. Bert [[alternative HTML version deleted]]