[R] Difference between difference of means

John Fox jfox at mcmaster.ca
Wed May 4 17:42:35 CEST 2005

Dear Peter,

This looks like a two-way ANOVA, with product as one factor and condition as
the other. The test that you describe is for the interaction between product
and condition.

I hope this helps,

John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Peter Zorg
> Sent: Wednesday, May 04, 2005 9:24 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Difference between difference of means
> Hi
> I would like to compare two differences of means.
> I have the means of the log of one variable for two 
> conditions for one product, and for another product.
> The differences look different between both products for the 
> two conditions, but a statistical test is required.
> Thank you for any hint
> Peter
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