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Message-ID: <A29987079A478A4A91B7210BC46CE0D05B576A312A@exmbx3.ad.slu.se> Date: 2012-05-11T14:13:54Z From: Rosario Garcia Gil Subject: Multiple regression Categorical data Hello It is possible to set up an lm() model where none of the categories of the categorical independent variable need to be used as references, I mean use the total mean instead. Thanks /R