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.
Note that 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 computer code and data files described and made available on this web page are 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.