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...erwise, since there are a lot more incteractions that I do not wish to test than interactions that I do wish to test, is there an alternative by which instead of having to exclude the interactions that I do not wish to test, I can simply run models with the interaction terms that I include in my lm fromula? Thank you in advance for your time, Agnese

hi I want to choose proper knot for the following formula formula = y~ s(x1) + s(x2) + s(x3) + s(x4) + s(x5) + s(x6) +s(x7) + s(x8) gam(fromula,data=dat) if i run the error is Error in smooth.construct.tp.smooth.spec(object, dk$data, dk$knots) : A term has fewer unique covariate combinations than specified maximum degrees of freedom how to find k and rectify this error ----- Thanks in Advance Arun -- View this message in co...