Date:         Sun, 21 Feb 1999 16:09:20 -0500
Reply-To:     "Bessemer, David W." <Bessemer@FTKNOXARI-EMH15.ARMY.MIL>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@UGA.CC.UGA.EDU>
From:         "Bessemer, David W." <Bessemer@FTKNOXARI-EMH15.ARMY.MIL>
Subject:      Re: Looking for the CI for Odds Ratio
Comments: cc: MFS@VAX.LOYOLA.EDU
Content-Type: text/plain

Martin,
 
According to Bishop, Fienberg & Holland (1975), Discrete
Multivariate Analysis,  the approximate large sample estimate
of the variance of the odds ratio (a) is:
 
VAR(a) = a x a [ 1/x(11) + 1/x(12)  + 1/x(21) + 1/x(22)]
 
where all the observed counts x(ii) are greater than zero.
 
I hope this helps,
 
Dave
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David W. Bessemer
bessemer@ftknoxari-emh15.army.mil
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US Army Research Institute
Armored Forces Research Unit
ATTN: TAPC-ARI-IK (Bessemer)
Fort Knox, KY 40121-5620
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Any opinion stated in this message is
entirely my own, not an official position
of the US Army Research Institute.
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