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PDF

Evaluates the PDF of the Beta distribution.
double PDF (double x, double a, double b)
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CDF

Returns the area from zero to x under the beta density.
double CDF (double x, double a, double b)[inline]
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CDF Inv

Evaluates the inverse of the Beta CDF.
double CDF_inv (double y, double alpha, double beta)[inline]
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Random Sample

Cheng's BB algorithm for generating Beta distribution random values
double sample (double alpha, double beta, double seed=0)