[R] ANOVA model

[Doran, Harold]

You are missing a grouping factor and you don't need to specify main
effects and the interaction. 

You just need

lme(height~treatment*genotype, random=~genotype|ID, drought)

If you're using lme4 and not nlme you would specify this as

lmer(height~treatment*genotype+(genotype|ID), drought)

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Street N.R.
Sent: Thursday, April 21, 2005 12:13 PM
To: r-help at stat.math.ethz.ch
Subject: [R] ANOVA model

Hi,

Could someone tell me if this is the correct model syntax for the
following dataset:

lme(height~treatment+genotype+treatment*genotype,drought,random=~genotyp
e)

The dataset has two factors: one fixed - treatment, and one random -
genotype. I need to test the effect of both factors to identify their
significance. There are multiple (but not equal) replicates at each
level of genotype (the replicates are independent biological samples).

What I need are the p values for genotype, treatment and their
interaction. It is the specification of the random factor that I am
unsure of.

Also, does anyone know if biologists 'expect' to see type I or type III
SS results presented in a standard (i.e. non statistical) journal
article?

Thanks in advance

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