Computations for approximations and alternatives for the 'DPQ'
(Density (pdf), Probability (cdf) and Quantile) functions for probability
distributions in R.
Primary focus is on (central and non-central) beta, gamma and related
distributions such as the chi-squared, F, and t.
--
This is for the use of researchers in these numerical approximation
implementations, notably for my own use in order to improve R`s own
pbeta(), qgamma(), ..., etc: {'"dpq"'-functions}.
-- We plan to complement with 'DPQmpfr' to be suggested later.