[R] parameterization of factor in R

From: Oana Mocila <oanaom_at_hotmail.com>
Date: Wed 28 Dec 2005 - 05:58:23 EST


Hi all,

I encountered this problem with parameterization in R:

I have two factors in a regression. how about if I want to set constraint so that for each factor, the sum of their coefficients equals to zero(instead of choosing a reference category)? for example, I have factor(variable) A(with three categories) and factor(variable) B(with 4 categories), and I want to parameterize so that the sum of the three coefficients of A = 0, and sum of the four coefficients of B = 0? I mean how to do it in R?

Oana



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