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Re: st: Binomial confidence intervals

From   Constantine Daskalakis <>
Subject   Re: st: Binomial confidence intervals
Date   Tue, 07 Sep 2004 13:44:45 -0400

At 01:24 PM 9/7/2004, Richard Williams wrote:
The -ci- command includes several options for computing binomial confidence intervals: exact (the default), wilson, agresti and jeffreys. Just so I am clear on these, is "exact" really really really exact? Am I correct in guessing that "exact" can be the most difficult to do by hand, and the others are therefore approximations that are somewhat easier to calculate if you don't have a computer? Is there any reason I would not want to use "exact", other than perhaps to replicate a calculation done using one of the other methods? Thanks for any insights.

Richard Williams, Notre Dame Dept of Sociology
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I remember checking this at some point. The "exact" option indeed gives the exact binomial confidence interval (which requires an iterative algorithm to get the limits, eg, bifurkation algorithm). StatXact calls this the "Clopper-Pearson" interval.

I have no idea what these other intervals are and why we need them. I was not aware of those options and they are not documented in the manual.

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Constantine Daskalakis, ScD
Assistant Professor,
Biostatistics Section, Thomas Jefferson University,
211 S. 9th St. #602, Philadelphia, PA 19107
Tel: 215-955-5695
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