[BioC] Type III Sum of Squares Calculation

Man, Michael Michael.Man at pfizer.com
Wed Oct 22 14:30:54 MEST 2003

Hope this helps.  -michael

calculating type III SS			
	Use Anova(lm, type = "III") in the "car" package
          C:\Program Files\R\rw1031\library\car\html\Anova.html

	(below is from Brian D. Ripley)
	Yes, but we don't tell you how to avoid leading you into a mire. See

	Most of the time drop1() does what people are using `Type III' for.
          (C:\Program Files\R\rw1031\library\base\html\add1.html)  

 -----Original Message-----
From: 	Subramanian Karthikeyan [mailto:Subramanian_Karthikeyan at hc-sc.gc.ca]

Sent:	Tuesday, October 21, 2003 8:09 AM
To:	bioconductor at stat.math.ethz.ch
Subject:	[BioC] Type III Sum of Squares Calculation

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.

Thanks very much.


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