[BioC] paired t-test

James W. MacDonald jmacdon at med.umich.edu
Wed May 13 15:18:32 CEST 2009

Hi Yogi,

Yogi Sundaravadanam wrote:
> Hi all,
> I have six samples with the following design
> ID    Sample    Type    C1    A    Control    C2    A    Treated
> C3    B    Control    C4    B    Treated
> C5    C    Control
> C6    C    Treated
> A, B, and C are three patients
> Would a paired t-test work better than one-way ANOVA here? Do I need 
> more replicates?

You definitely want to account for the intra-patient dependence 
structure somehow. One way would be to do a paired t-test. The other way 
would be to do a linear mixed model-ish thing using 
duplicateCorrelation() to capture the intra-patient correlation.

There have been numerous posts about the latter, and if I am not 
mistaken there is an example in the Limma User's Guide as well.



> thanks for your help
> Yogi
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James W. MacDonald, M.S.
Douglas Lab
University of Michigan
Department of Human Genetics
5912 Buhl
1241 E. Catherine St.
Ann Arbor MI 48109-5618

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