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 -------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario Canada L8S 4M4 905-525-9140x23604 http://socserv.mcmaster.ca/jfox -------------------------------- > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Peter Zorg > Sent: Wednesday, May 04, 2005 9:24 AM > To: [email protected] > 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 > > __________________________________________________ > > > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
