[R] Odp: Anova

[Petr PIKAL]

Hi

r-help-bounces at stat.math.ethz.ch napsal dne 11.05.2007 07:26:00:

> Doea anyone know how to compute components of variance analysis? For 
example, 
> I have the score of pupils on a test. Each pupil belongs to a school and 

> within each school I may have several classes? How can I estimate the 
variance
> of the pupils, schools, classes and the errror variance?
> 
> 
> Any examples?

What is wrong with examples in ?aov or ?lm pages?

e.g.
## From Venables and Ripley (2002) p.165.
data(npk, package="MASS")

## Set orthogonal contrasts.
op <- options(contrasts=c("contr.helmert", "contr.poly"))
( npk.aov <- aov(yield ~ block + N*P*K, npk) )
summary(npk.aov)
coefficients(npk.aov)

Regards
Petr

> 
> Any help will be appreciated.
> 
> Jason
> 
> 
> Dr. Iasonas Lamprianou
> Department of Education
> The University of Manchester
> Oxford Road, Manchester M13 9PL, UK
> Tel. 0044 161 275 3485
> iasonas.lamprianou at manchester.ac.uk
> 
> 
>       ___________________________________________________________
> 
> now.
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