[R] Doubt about nested aov output

From: Ronaldo Reis-Jr. <chrysopa_at_gmail.com>
Date: Wed 31 Aug 2005 - 00:01:32 EST


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

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Received on Wed Aug 31 00:07:39 2005

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