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...ues. Would I simply do as follows?: yield<- c(4.54,4.64,5.27,5.81,5.73,7.05,5.81,6.30) sulfur <- c(1,2,3,4,1,2,3,4) nitro <- c(1,1,1,1,2,2,2,2) summary(aov(yield~sulfur*nitro)) Thanks, DM ----- Original Message ---- From: Ben Fairbank <BEN at SSANET.COM> To: David Mackovjak <bejitto101 at yahoo.com> Sent: Wednesday, March 19, 2008 3:14:36 PM Subject: RE: [PS] [R] Two Way ANOVA DM -- I think it would be helpful if you could also tell us what it is you are hoping to find out from the analysis. For example, a statement such as "I am seeking to find if there are any effec...