Message-ID: <20040412152053.2910DEDE2@slim.kubism.ku.dk>
Date: 2004-04-12T17:20:55Z
From: terra@diku.dk
Subject: pbinom accuracy (PR#6757)
Full_Name: Morten Welinder
Version: snapshot
OS:
Submission from: (NULL) (65.213.85.129)
There is really no good reason for throwing part of p's precision away in
pbinom.
Using Ambramowitz & Stegun 26.5.2:
- return pbeta(1 - p, n - x, x + 1, lower_tail, log_p);
+ return pbeta (p, x + 1, n - x, !lower_tail, log_p);