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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


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 -------------------------------------------------------- David W. Bessemer -------------------------------------------------------- US Army Research Institute Armored Forces Research Unit ATTN: TAPC-ARI-IK (Bessemer) Fort Knox, KY 40121-5620 -------------------------------------------------------- Any opinion stated in this message is entirely my own, not an official position of the US Army Research Institute. --------------------------------------------------------

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