[R] proportions - finite population correction
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Thu Jun 15 13:48:58 CEST 2000
RINNER Heinrich <H.RINNER at TIROL.GV.AT> writes:
> > Dear R-users!
> >
> > I am using R 1.0.0 and Windows NT 4.0.
> >
> Suppose I have a population of N=100 subjects, a binomial variable and a
> random sample of n=20 subjects from my population, giving 15 "successes". I
> am interested in obtaining a confidence interval for the proportion of
> "successes" in my population.
>
> In R, I can use
> > library(ctest)
> > binom.test(15, 20)
> to get an exact confidence interval, but under the assumption of an infinite
> population.
>
> Now I could modify binom.test so that a finite population correction is
> applied (the formulae are right here in the book before me); but maybe
> somebody has already done this, or maybe there are other (R-)functions that
> can already do that?
I don't think we have a test as such, but the stubs must be in phyper:
uniroot(function(x)phyper(15,x,100-x,20)-0.025,,0,100)$root
uniroot(function(x)phyper(14,x,100-x,20)-0.975,,0,100)$root
should be about right I think.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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