R help - May 2007 - Anova

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?

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@manchester.ac.uk


      ___________________________________________________________

now.

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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.
> 
>    [[alternative HTML version deleted]]
> 
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