This library contains routines to compute cumulative distribution functions, inverses, and parameters of the distribution for the following set of statistical distributions: (1) Beta (2) Binomial (3) Chi-square (4) Noncentral Chi-square (5) F (6) Noncentral F (7) Gamma (8) Negative Binomial (9) Normal (10) Poisson (11) Student's t (12) Noncentral t Given values of all but one parameter of a distribution, the other is computed. These calculations are done with double precision C variables.