R help - Sep 2011 - two-way anova help

Hello,

I am having some trouble coding a two-way anova due to replicated
treatments.

I have a factorial design with three male parents and three female parents.
They were mated in all combinations and their babies were grown out and
measured for size.  50 babies were measured for each of the 9 crosses.  If I
stopped here, I would have no troubles.  But I also have 5 replicate tanks
for each of the 9 crosses.  My question is how to I code in the 5 replicate
tanks per treatment?

Thanks,
Austin

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Can you explain what do you mean by "5 replicate tanks"?

Doing a two way anova is very simple in R. You would need to fit a linear model
(lm function).


Eg.:
> model <- lm(y ~ male + female + male:female, data =)

Regards,
Indrajit



________________________________
From: Austin Paul <austinpa@usc.edu>
To: r-help@r-project.org
Sent: Tuesday, September 27, 2011 6:13 AM
Subject: [R] two-way anova help

Hello,

I am having some trouble coding a two-way anova due to replicated
treatments.

I have a factorial design with three male parents and three female parents.
They were mated in all combinations and their babies were grown out and
measured for size.  50 babies were measured for each of the 9 crosses.  If I
stopped here, I would have no troubles.  But I also have 5 replicate tanks
for each of the 9 crosses.  My question is how to I code in the 5 replicate
tanks per treatment?

Thanks,
Austin

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