[R-sig-ME] comparing 3 levels of fixed factor in lme4

peter dalgaard pdalgd at gmail.com
Mon Jul 30 12:38:28 CEST 2012

On Jul 30, 2012, at 08:04 , Obermeier Andrew wrote:

> In lme4, in models with 3 levels of the fixed factor, each of these gets a t value comparing it to a reference level.
> How is this done? 
> It is my understanding that the t value can only be used to compare 2 means.

Then your understanding is wrong, and you need to read a text on basic linear modelling theory. Nothing specifically mixed-model or even R relevant about that.

Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com

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