[R] Odds Ratio calculation

Uwe Ligges ligges at statistik.uni-dortmund.de
Mon Nov 26 22:21:31 CET 2007

sigalit mangut-leiba wrote:
> Hello,
> I want to calculate Odds Ratio.
> I have a binary outcome and  two groups of exposure: '1' are exposed, and
> '2' are not-exposed.
> I want '2' to be the reference group.
> By "factor" I get group '1' as a reference because it sorted in increasing
> order.
> How do I change it?

See ?factor and learn to use the "levels" argument of factor().

Uwe Ligges

> Thank you,
> Sigalit.
> 	[[alternative HTML version deleted]]
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