[R] Anova unbalanced

[Jose Iparraguirre]

Dear Claudia,

Your question has been posed on many previous occasions. 
The (short) answer has always been the same: have a look at the Anova function in the car package but before doing that, get a copy of John Fox's "Applied Regression Analysis and Generalized Linear Models" book.
Best,

José


José Iparraguirre
Chief Economist
Age UK

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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of paladini
Sent: 17 April 2013 10:47
To: r-help at r-project.org
Subject: [R] Anova unbalanced

Hello everybody,
I have got a data set with about 400 companies. Each company has a 
score for its enviroment comportment between 0 and 100. These companies 
belong to  about 15 different countries. I have e.g. 70 companies from 
UK and 5 from Luxembourg,- so the data set is pretty unbalanced and I 
want to do an ANOVA. Somthing like aov(enviromentscore~country). But the 
aov function is just for a balanced design.
So I wonder if I can use fit=lm(enviromentscore~country), anova (fit) 
instead? Would this be okay or can it also only be used with balanced 
data?

Thanking you in anticipation, best regards


Claudia

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