[BioC] Type III Sum of Squares Calculation

Subramanian Karthikeyan Subramanian_Karthikeyan at hc-sc.gc.ca
Wed Oct 22 18:07:50 MEST 2003

Thanks Mike,

Is there a way of automating the task (e.g. using Perl  or within R itself,
maybe using a loop or something like that, so that I can I do a
high-throughput analysis of several datasets, and then output/export the
result tables in an excel spreadsheet?

Any hint would be useful.

Thanks again,

                      "Man, Michael"                                                                                                   
                      <Michael.Man at pfiz        To:       "'Subramanian Karthikeyan'" <Subramanian_Karthikeyan at hc-sc.gc.ca>,            
                      er.com>                   bioconductor at stat.math.ethz.ch                                                         
                      2003-10-22 08:30         Subject:  RE: [BioC] Type III Sum of Squares Calculation                                

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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