R help - Feb 2010 - Normality in split-plot design

Hi,

I would like to test the normality of errors in an 
split-plot design using R.

I used the following program:

anava = aov(ganhos ~ Blocos + Trat*Supl + 
Error(Blocos/Trat))
summary(anava)

bartlett.test(ganhos, Trat)
bartlett.test(ganhos, Supl)

How can I test the normality of the errors?

Thanks,

--------------------------------------
Silvano Cesar da Costa
Departamento de Estat?stica
Universidade Estadual de Londrina
Fone: 3371-4346

Silvano,

To test normality of the erros you can use

m0 <- aov(...)
shapiro.test(residuals(m0))

or another test like Kolmogorov-Smirnov (ks.test), Jarque-Bera
(jarque.test{moments}, jarque.bera.test{tseries}) among others.
Fell free to join our R brazilian group on yahoo groups named R_STAT. You
will welcome.

Bests.
Walmes Zeviani. Lavras, MG, Brasil.

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..(....)... 0ooo...                              Walmes Zeviani
...\..(.....(.....)...     Master in Statistics and Agricultural
Experimentation
....\_)..... )../....       walmeszeviani at hotmail.com, Lavras - MG, Brasil
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