[R] Doubt about nested aov output

[Spencer Graves]

	  Others may know the answer to your question, but I don't.  However, 
since I have not seen a reply, I will offer a few comments:

	  1.  What version of R are you using?  I just tried superficially 
similar things with the examples in ?aov in R 2.1.1 patched and 
consistently got F and p values.

	  2.  My preference for this kind of thing is to use lme in 
library(nlme) or lmer in library(lme4).  Also, I highly recommend 
Pinheiro and Bates (2000) Mixed-Effects Models in S and S-Plus (Springer).

	  3.  If still want to use aov and are getting this problem in R 2.1.1, 
could you please provide this list with a small, self contained example 
that displays the symptoms that concern you?  And PLEASE do read the 
posting guide! "http://www.R-project.org/posting-guide.html".  It might 
increase the speed and utility of replies.

	  spencer graves

Ronaldo Reis-Jr. wrote:

> Hi,
> 
> I have two doubts about the nested aov output.
> 
> 1) I have this:
> 
>>anova.ratos <- aov(Glicogenio~Tratamento+Error(Tratamento/Rato/Figado))
>>summary(anova.ratos)
> 
> 
> Error: Tratamento
>            Df  Sum Sq Mean Sq
> Tratamento  2 1557.56  778.78
> 
> Error: Tratamento:Rato
>           Df Sum Sq Mean Sq F value Pr(>F)
> Residuals  3 797.67  265.89               
> 
> Error: Tratamento:Rato:Figado
>           Df Sum Sq Mean Sq F value Pr(>F)
> Residuals 12  594.0    49.5               
> 
> Error: Within
>           Df Sum Sq Mean Sq F value Pr(>F)
> Residuals 18 381.00   21.17               
> 
> R dont make the F and P automatically, it is possible?
> 
> I Like an output like this:
> 
> Error: Tratamento
>            Df  Sum Sq Mean Sq F value Pr(>F)
> Tratamento  2 1557.56  778.78   2.929 0.197
> 
> Error: Tratamento:Rato
>           Df Sum Sq Mean Sq F value Pr(>F)
> Residuals  3 797.67  265.89   5.372 0.0141      
> 
> Error: Tratamento:Rato:Figado
>           Df Sum Sq Mean Sq F value Pr(>F)
> Residuals 12  594.0    49.5   2.339 0.0503        
> 
> Error: Within
>           Df Sum Sq Mean Sq F value Pr(>F)
> Residuals 18 381.00   21.17         
> 
> Why it not make automatic calculations? It is possible?
> 
> 
> 2) I can say that Error: Tratamento:Rato means an interaction between 
> Tratamento and Rato? Normally the : represents an interaction, but in this 
> output I think that it dont mean the interaction. 
> 
> Any explanation are welcome.
> 
> Thanks
> Ronaldo

-- 
Spencer Graves, PhD
Senior Development Engineer
PDF Solutions, Inc.
333 West San Carlos Street Suite 700
San Jose, CA 95110, USA

spencer.graves at pdf.com
www.pdf.com <http://www.pdf.com>
Tel:  408-938-4420
Fax: 408-280-7915