[BioC] OddsRatio in COstats
James W. MacDonald
jmacdon at med.umich.edu
Tue May 20 16:46:39 CEST 2008
Mikhail Pachkov wrote:
> Dear All,
> Could somebody explain me how exactly odds ratio is calculated by
> hgCondOver in GOstats?
No idea what hgCondOver is. However, the odds ratio is calculated the
'regular' way. Say you have a 2x2 table like this:
Sel N11 N12
NotSel N21 N22
Then the OR is calculated as (N11*N22)/(N21*N12).
The only difference with a conditional or directional analysis is how
you calculate the universe or decide what is differentially expressed.
> Thank you in advance!
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James W. MacDonald, M.S.
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
Ann Arbor MI 48109
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