[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,
Karth.
"Man, Michael"
<Michael.Man at pfiz To: "'Subramanian Karthikeyan'" <Subramanian_Karthikeyan at hc-sc.gc.ca>,
er.com> bioconductor at stat.math.ethz.ch
cc:
2003-10-22 08:30 Subject: RE: [BioC] Type III Sum of Squares Calculation
AM
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
http://www.stats.ox.ac.uk/pub/MASS3/Exegeses.pdf.
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.
Karth.
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