[R] change the "coeffcients approach" on an anova

[Gabor Grothendieck]

On 7/7/07, vincent guyader <guyader at agrocampus-rennes.fr> wrote:
> hi everybody
>
> I have to do a lot of Anova with R and I would like to have another type of
> coefficients coding.. I explain.
>
> by default if I have 2 temperatures for an experience. 100°C or 130°C and I
> want to see the temperature effect on the presure
> I want to estimate the coefficient of each temperature.
>
> I will obtain ,with the anova, juste one coefficients for example +3,56 (for
> 100°C), and the other (for 130°C) is always  zero.
>
> but I prefer to obtain + 1,78 or the first effect and -1,78 for the second
> (the intercept is also different too)
>
> my script is (it s just an example)
>
> rinfo2 <- (lm(pression~ temp, data=rebe))

Try:

lm(pression ~ temp + 0, rebe)



> anova(rinfo2)
> summary(rinfo2)
>
> what can I change to obtain what I need?
>
> best regards
>
>
>
> --
> _________________________________
> Vincent GUYADER
> École nationale supérieure d'agronomie de Rennes (ENSAR)
> EN156 - Spécialité statistiques appliquées
> 06.22.85.34.27
>
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