
Hi Richard,

First thank you for your attention. Actually
the way it approached the examples of statements do not like a lot,
because the calculations are done separately for each factor of
interest to the interaction. Why will not it pleases me so much? Tukey's tests as for example using the mean square error (MSE) for the calculation of minimum significant differences (MSD). When
the analysis is done separately, the contrasts are made with the new
model, rather than the original model which contained the interactions. Thus the contrasts are different, since they use different MSE. What is your opinion?

 
M.Sc Ivan Bezerra Allaman 
Zootecnista
Doutorando em Produção Animal/Aquicultura - UFLA 
email e msn - ivanalaman@yahoo.com.br 
Tel: (35)3826-6608/9925-6428




________________________________
De: Richard M. Heiberger [via R] <ml-node+2236373-99253941-109182@n4.nabble.com>

Enviadas: Domingo, 30 de Maio de 2010 13:09:37
Assunto: Re: How to use the function "glht" of multcomp package to test interaction?

Usually you will want to look at simple effects of the factors when there is 
interaction.  Please look at the WoodEnergy demos in the HH package. 
These examples use glht. 

install.packages("HH")  ## if you don't currently have HH 
library(HH) 
demo("MMC.WoodEnergy-aov") 
demo("MMC.WoodEnergy") 

Rich 

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