R help - Jan 2008 - Confidence intervals for beta distribution

Dear R users,

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)

Also, is there a way to get CI for a dirichlet distribution?

Many Thanks in advance,
Eleni Rapsomaniki

> 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(...), ...).

Regards,
Richie.

Mathematical Sciences Unit
HSL


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