Utility Functions for dgamma()
-- Pure R Versions
HyperGeometric (Point) Probabilities via Molenaar's Binomial Approximation
Gamma Density Function Alternatives
Non-central t-Distribution Density - Algorithms and Approximations
DPQ
Approximations of the (Noncentral) Chi-Squared Density
Compute log(gamma(b)/gamma(a+b)) when b >= 8
Bernoulli Numbers
Compute f(a) = \(\mathrm{log}\)(1 - \(\mathrm{exp}\)(-a))
Numerically Optimally
Compute \(E[\chi_\nu] / \sqrt{\nu}\)
useful for t- and chi-Distributions
Noncentral t Distribution Density by W.V.
Accurate log(1+x) - x
HyperGeometric Distribution via Approximate Binomial Distribution
Transform Hypergeometric Distribution Parameters to Binomial Probability
Normal Approximation to cumulative Hyperbolic Distribution -- AS 152
Pure R Implementation of Old pbeta()
Format Numbers in [0,1] with "Precise" Result
Compute Hypergeometric Probabilities via Binomial Approximations
Asymptotic Log Gamma Function
Simple R level Newton Algorithm, Mostly for Didactical Reasons
Logspace Arithmetix -- Addition and Subtraction
Continued Fraction Approximation of Log-Related Series
Accurate log(gamma(a+1))
HyperGeometric Distribution via Molenaar's Binomial Approximation
Pearson's incomplete Beta Approximation to the Hyperbolic Distribution
R -only version of R 's original phyper() algorithm
Compute (Approximate) Quantiles of the Gamma Distribution
Pure R version of R's C level phyper()
R versions of Simple Formulas for Logarithmic Binomial Coefficients
Compute (Approximate) Quantiles of the Beta Distribution
Compute Approximate Quantiles of Noncentral Chi-Squared Distribution
(Log) Beta Approximations
(Probabilities of Non-Central Chi-squared Distribution for Special Cases
Properly Compute the Logarithm of a Sum (of Exponentials)
Noncentral Beta Probabilities
Compute Logarithm of a Sum with Signed Large Summands
(Approximate) Probabilities of Non-Central Chi-squared Distribution
Peizer's Normal Approximation to the Cumulative Hyperbolic
Molenaar's Normal Approximations to the Hypergeometric Distribution
Approximations to 'qnorm()', i.e., \(z_\alpha\)
Compute Approximate Quantiles of Non-Central t Distribution
Compute Approximate Quantiles of the Chi-Squared Distribution
Numerical Utilities - Functions, Constants
The Four (4) Symmetric phyper() calls.
Wienergerm Approximations to (Non-Central) Chi-squared Probabilities
Compute Relative Size of i-th term of Poisson Distribution Series
Plot 2 Noncentral Distribution Curves for Visual Comparison
Direct Computation of 'ppois()' Poisson Distribution Probabilities
Non-central t Probability Distribution - Algorithms and Approximations