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Re: Beta distribution

From: Ben Pfaff
Subject: Re: Beta distribution
Date: Sat, 19 Mar 2005 11:48:27 -0800
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.3 (gnu/linux)

John Darrington <address@hidden> writes:

> I've got a change (soon to be checked in) which touches a lot of
> files, but none of the randist stuff and none of the expression stuff,
> but my change gives completely different values for the some of the
> BETA and INV.F functions.  

Are you sure you aren't comparing the results from an older
version of PSPP (that uses the old idf_beta() code I wrote) against
a newer version (that uses Jason's gsl_cdf_beta_Pinv())?  The
older code is not as good; Jason knows a lot more about this
stuff than I do.

Among other changes, the older version would have
src/expressions/operations.def version 1.4; the newer version
would have version 1.5.
Ben Pfaff 
email: address@hidden

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