asa226, a Fortran77 code which evaluates the cumulative distribution function (CDF) of the noncentral Beta Distribution, by Russell Lenth.
This is a version of Applied Statistics Algorithm 226.
The program can produce reasonably accurate answers for values of the noncentrality parameter up to about 100.
An improvement was suggested by Frick. When I run the improved copy, the computation fails. Therefore, the version I have put together has suppressed the improvement for now until I can determine the stray minus sign or logic error causing the problem.
The information on this web page is distributed under the MIT license.
asa226 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 Russell Lenth; This version by John Burkardt.