[R] Orthogonal polynomial contrasts

From: Chris Bennett <bop07crb_at_sheffield.ac.uk>
Date: Thu, 10 Apr 2008 04:57:06 -0700 (PDT)

How do you remove one of the terms from an ordered polynomial contrast in your linear model. For example, I have significant terms for linear and cubic but not quadratic, how would i remove the quadratic term from lm(response~treatment)

Cheers,
Chris

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