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1997 Apr 30
2
R-alpha: New Incomplete Beta Function
...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, double aa, double bb) { double a, b, t, x, xc, w, y; int flag; if (aa <= 0 || bb <= 0) goto domerr; if (xx <= 0 || xx >= 1) { if (xx == 0) r...