[R] too large alpha or beta in dbeta ?

Thomas Lumley thomas at biostat.washington.edu
Thu Aug 24 22:45:47 CEST 2000

On Thu, 24 Aug 2000, Troels Ring wrote:

> Dear friends.
> Is this as expected ? Is alpha and beta too large simply ?
>  > dbeta(.1,534,646)
> [1] NaN
> Warning message:
> NaNs produced in: dbeta(x, shape1, shape2, log)

well, it should work, but the correct answer is effectively zero.
  pbeta(.1,534,646) gives 3.6e-213

Perhaps more worrying is 
> dbeta(.25,534,646)
[1] Inf


Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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