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I have seen in nmath directory that (dpqr)f is about F distribution. The result obtained from these functions give the same result than The F Fisher-Snedecor in cephes lib (from http://www.moshier.net/). IIs it the same F (I think) and what's the difference between the two F. Cheers, Greg -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 513 bytes Desc: not available Url : https://www.stat.math....

...rks It'll be in an official second patch for 0.49 later in the week (so just swap it temporarily with the old one). Ross - - s n i p - - h e r e - - /* * Incomplete Beta Integral * * Taken from Cephes Math Library, Release 2.3: March, 1995 * Copyright 1984, 1995 by Stephen L. Moshier * Changes for R : Copyright 1997 by Ross Ihaka */ #include <math.h> #include <float.h> #include <errno.h> static double incbcf(), incbd(), pseries(); static double big = 4.503599627370496e15; static double biginv = 2.22044604925031308085e-16; double pbeta(double xx, doub...