From your description, it's not possible to tell what you did or exactly what happened -- either in R or in Minitab (and JMP).
John: in R, I fit the model using lm exactly as you did.. however, for the ANOVA table, I used summary(lm) and also tried aov(lm) but not anova(lm) ... and it looks like therein lies the problem.. the output of these differ.
What's the difference between aov, summary and anova? And when should one use one as opposed to the other? It's hard to tell from the help for these functions...
Thanks, nirmal
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