4:08 PM
To: Patrick Connolly
Cc: r-help@r-project.org
Subject: Re: [R] Anova interaction not tested
Playing around with this some more, it looks like it may purely be due to
the way that R handles unbalanced data. I will investigate lme for this.
Best,
Gabe
On Wed, Apr 8, 2009 at 3:24 PM
I've noticed with certain datasets that when I try to do an anova and test
for main effects and interaction for two explanatory variables, sometimes
the main effect results are given but not the interaction results. For
example,
ex1 = aov(Score ~ var1*var2, data=myData)
summary(ex1)
gives me
On Wed, 08-Apr-2009 at 12:59PM -0700, Gabriel Murray wrote:
| I've noticed with certain datasets that when I try to do an anova and test
| for main effects and interaction for two explanatory variables, sometimes
| the main effect results are given but not the interaction results. For
| example,
Here is some toy data to give an example. Imagine someone is test-riding
several bicycles to decide which to buy, and measures their average speed
during each test-ride. They want to assess the main effects and interaction
of brand and material on speed.
SpeedSizeBrandMaterial
20
Playing around with this some more, it looks like it may purely be due to
the way that R handles unbalanced data. I will investigate lme for this.
Best,
Gabe
On Wed, Apr 8, 2009 at 3:24 PM, Gabriel Murray p.edi...@gmail.com wrote:
Here is some toy data to give an example. Imagine someone is
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