[R] Confidence intervals for beta distribution

Richard.Cotton at hsl.gov.uk Richard.Cotton at hsl.gov.uk
Thu Jan 3 16:25:58 CET 2008

> Sorry if this is too trivial. Is there a way to get confidence intervals 
for a
> beta distribution? e.g. Is this wrong for calculating the 2.5% lower CI 
for a
> distribution with parameters 13.2 and 691?
> qbeta(0.025, 13.2, 691)

This looks fine.

> Also, is there a way to get CI for a dirichlet distribution?
The package gtools has functions for generating random dirichlet 
variables.  Not quite what you wanted, I know, but you can get an estimate 
of percentiles by calling quantile(rdirichlet(...), ...).


Mathematical Sciences Unit


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