[R] linear models with factors

[Christophe Pallier]

See ?contrasts and ?contr.sum

By default, R uses contr.treatment, you want contr.sum

Christophe


On Sat, Feb 12, 2011 at 6:57 AM, ATANU <ata.sonu at gmail.com> wrote:
>
> i am trying to fit a linear model with both continuous covariates and
> factors. When fitted with the intercept
> term the first level of the factor is treated by R as intercept and the
> estimate of the effects of remaining levels(say i th level)  are given as
> true estimate of i th level - estimate of 1st level. i want the estimates of
> coefficients of  each level along with the intercept term(general
> effect).can anyone please help me?
> thanks in advance.....
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-- 
Christophe Pallier  <christophe at pallier.org>
tel: +33 (0)1 69 08 79 34
Unité de Neuroimagerie Cognitive INSERM-CEA,
Neurospin center, F91191 Gif-sur-Yvette, France
web site: http://www.unicog.org
personal web site: www.pallier.org