R help - Aug 2007 - Exact Confidence Intervals for the Ration of Two Binomial

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.

Tony.
	[[alternative HTML version deleted]]

On Thu, 23 Aug 2007, Antonio_Paredes at aphis.usda.gov 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:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901

At 18:28 23/08/2007, Antonio_Paredes at aphis.usda.gov
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.
If you go to
https://www.stat.math.ethz.ch/pipermail/r-help//2006-November/thread.html
and search that part of the archive for "relative risk" you will find 
a number of suggestions. Unfortunately the responses are not all 
threaded so you need to search the whole thing.
>Tony.
>         [[alternative HTML version deleted]]
Michael Dewey
http://www.aghmed.fsnet.co.uk