On Thu, 23 Aug 2007, [EMAIL PROTECTED] wrote:
> Hello everyone,
>
> I will like to know if there is an R package to compute exact confidence
> intervals for the ratio of two binomial proportions.
Probably not. This is a tricky business as the references below make
clear.
To wit, small sample intervals cannot be based on conditioning on an
ancillary statistic (Santer and Snell, 1980) and those small sample
intervals that can be constructed are only 'exact' in a particular sense
(Mantel, 1988).
@misc{mantel1988elr,
title={{Exact Limits on the Ratio or Difference of Two Independent
Binomial Proportions?}},
author={Mantel, N.},
journal={Biometrics},
volume={44},
number={2},
pages={623--623},
year={1988},
publisher={JSTOR}
}
@article{santner1980ssc,
title={{Small-Sample Confidence Intervals for p\_1-p\_2 and p\_1/p\_2 in
2*2 Contingency Tables}},
author={Santner, T.J. and Snell, M.K.},
journal={Journal of the American Statistical Association},
volume={75},
number={370},
pages={386--394},
year={1980},
publisher={JSTOR}
}
>
> Tony.
> [[alternative HTML version deleted]]
>
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>
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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