The Anova function in the car package can calculate "type-III" sums of squares, though it doesn't do so by default. Be careful with the contrast coding or you will get nonsense (and you might want to think about whether you really want type-III SSs).
I hope that this helps, John
At 08:01 AM 10/21/2003 -0400, Subramanian Karthikeyan wrote:
HI All:
Can anyone give me the formulae/steps for calculating the type III sum of squares for an unbalanced 2-way ANOVA design? Eg. we are looking at 8 treatments x 4 doses, with unequal numbers of replications within the groups. I really need the stepwise calculation, as I would try to put it in my own code (possibly in Visual Basic) to automate the task.
----------------------------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario, Canada L8S 4M4 email: [EMAIL PROTECTED] phone: 905-525-9140x23604 web: www.socsci.mcmaster.ca/jfox
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