I suppose you're referring to the sentence (or whatever it corresponds to in the French version you cited): "This means that the order in which the variables are selected will not have any effect on the values in the Type III SS. The Type III SS is generally the best method to use to interpret results when an interaction is part of the model." I would suggest that you take it up with XLSTAT support. Andy From: justin bem> > Hi, > > I am very confused about those note that I found in > this web page about TYPE III SS in ANOVA. In my mind > Type III is not useful when there are interaction. > Can someone help me ? > > web site : > http://www.xlstat.com/fr/support/tutorials/ano2.htm > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > >