R help - Dec 2008 - How test contrasts/coefficients of Repeated-Measures ANOVA?

Hi all,

I'm doing a Repeated-Measures ANOVA, but I don't know how to test its  
contrasts or where to find the p-values of its coefficients. I know  
how to find the coefficient estimates of a contrast, but not how to  
test these estimates.

First I do something like:

y.aov <- aov(y ~ fac1 * fac2 + Error(subj/(fac1 * fac2)), data=data)

Then, with

coef(y.aov)

I get the coefficients (which are, by default, treatment contrasts?),  
but p-values are not provided.
How do I obtain these p-values?

~ Ben

Ben Meijering <b.meijering <at> student.rug.nl> writes:
> I'm doing a Repeated-Measures ANOVA, but I don't know how to test
its
> contrasts or where to find the p-values of its coefficients. I know  
> how to find the coefficient estimates of a contrast, but not how to  
> test these estimates.
> 
> First I do something like:
> 
> y.aov <- aov(y ~ fac1 * fac2 + Error(subj/(fac1 * fac2)), data=data)
> 
> Then, with
> 
> coef(y.aov)
> 
> I get the coefficients (which are, by default, treatment contrasts?),  
> but p-values are not provided.
See model.table and se.contrast;  and consider using lme in package nlme as an
alternative which make live much easier, if it can handle your (over?)complex
nesting.

Dieter