[R] Multiple regression Categorical data

[Greg Snow]

?contr.sum

On Fri, May 11, 2012 at 8:13 AM, Rosario Garcia Gil
<M.Rosario.Garcia at slu.se> wrote:
> 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
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-- 
Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com