asa109, a Fortran90 code which inverts the incomplete Beta function, by Cran, Martin and Thomas.
Given a value of the incomplete Beta function, it can determine the argument that produced that value.
The code is a version of Applied Statistics Algorithm 109.
The information on this web page is distributed under the MIT license.
asa109 is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
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Original Fortran77 version by GW Cran, KJ Martin, GE Thomas; This version by John Burkardt.