https://communities.sas.com/t5/SAS-Enterprise-Guide/Effects-of-Polynomial-terms/m-p/4841#M1561 I can't help on your basic question, but polynomials beyond the cube level are generally uninterpretable and highly unstable. The tails really whip around due to the data dependencies; if the data change even a little the coefficients can be very different. I think that Frank Harrell's Regression book has a discussion on it. Fri, 28 Sep 2007 16:17:34 GMT Doc_Duke 2007-09-28T16:17:34Z https://communities.sas.com/t5/SAS-Enterprise-Guide/Effects-of-Polynomial-terms/m-p/4840#M1560 Dose any body know how to lead the SAS Enterprise Guide to take the effects of my polynomial terms (Degrees 10) in the 'Polynomial' Model in 'Linear Models' in 'ANOVA' analysis, please? Thank you Fri, 28 Sep 2007 13:35:26 GMT https://communities.sas.com/t5/SAS-Enterprise-Guide/Effects-of-Polynomial-terms/m-p/4840#M1560 deleted_user 2007-09-28T13:35:26Z https://communities.sas.com/t5/SAS-Enterprise-Guide/Effects-of-Polynomial-terms/m-p/4841#M1561 I can't help on your basic question, but polynomials beyond the cube level are generally uninterpretable and highly unstable. The tails really whip around due to the data dependencies; if the data change even a little the coefficients can be very different. I think that Frank Harrell's Regression book has a discussion on it. Fri, 28 Sep 2007 16:17:34 GMT https://communities.sas.com/t5/SAS-Enterprise-Guide/Effects-of-Polynomial-terms/m-p/4841#M1561 Doc_Duke 2007-09-28T16:17:34Z