• mpmath

  • Referenced in 40 articles [sw05802]
  • plus a few nonelementary special functions (gamma, zeta, etc.), and has utilities for arbitrary-precision...
  • SPECFUN

  • Referenced in 22 articles [sw00895]
  • error functions and related functions, and gamma functions and related functions...
  • GammaCHI

  • Referenced in 8 articles [sw14496]
  • also provides routines for computing the gamma function, the error function and other functions related ... gamma function. The module includes the routines cdfgamC, invcdfgamC, cdfgamNC, invcdfgamNC, errorfunction, inverfc, gamma, loggam ... error function, the computation of: the gamma function, the logarithm of the gamma function ... regulated gamma function and the ratio of two gamma functions, respectively...
  • Algorithm 858

  • Referenced in 13 articles [sw09120]
  • with Jνi(x) the Bessel function of the first kind and (real) order ... approximated using the incomplete Gamma function Γ(a,z). Accurate error estimates are included...
  • Algorithm 542

  • Referenced in 7 articles [sw22830]
  • Algorithm 542: Incomplete Gamma functions. Taylor’s series and continued fractions for evaluating Tricomi ... incomplete gamma function and the complementary incomplete gamma function Gams...
  • Ooura

  • Referenced in 8 articles [sw26177]
  • Transform) - 1-dim / 2-dim; Special Functions - Gamma / Error Functions; Special Functions - Bessel Functions (integer...
  • Algorithm 814

  • Referenced in 6 articles [sw04662]
  • floating-point multiple precision arithmetic, gamma and related functions. A collection ... Fortran-90 routines for evaluating the gamma function and related functions using the FM multiple...
  • frailtypack

  • Referenced in 40 articles [sw06070]
  • hazard function but also a parametric estimation. 1) A shared gamma frailty model...
  • Algorithm 926

  • Referenced in 4 articles [sw12901]
  • Algorithm 926, incomplete gamma functions with negative arguments. An algorithm for accurately computing the lower ... incomplete gamma function γ(a,t) in the case where...
  • AS 245

  • Referenced in 5 articles [sw14094]
  • algorithm for the logarithm of the gamma function. This paper describes a Fortran 77 algorithm...
  • Algorithm 955

  • Referenced in 3 articles [sw17442]
  • inverse of the incomplete gamma function are derived, which are used to develop efficient evaluations ... inverse Poisson cumulative distribution function. An asymptotic approximation based on the standard Normal approximation ... Temme’s approximation of the incomplete gamma function is more efficient due to conditional branching...
  • IncgamNEG

  • Referenced in 3 articles [sw16456]
  • Algorithm 969: Computation of the Incomplete Gamma Function for Negative Values of the Argument ... algorithm for computing the incomplete gamma function γ*(a, z) for real values...
  • VarianceGamma

  • Referenced in 4 articles [sw11603]
  • Gamma Distribution. This package provides functions for the variance gamma distributions. Density, distribution and quantile ... fitting of the variance gamma to data. Also, functions for computing moments of the variance ... gamma distribution of any order about any location. In addition, there are functions for checking ... different sets of parameterizatons for the variance gamma distribution...
  • GRATIO

  • Referenced in 3 articles [sw24353]
  • FORTRAN subroutines for computing the incomplete gamma function ratios and their inverse. The FORTRAN subroutines ... computing the incomplete gamma function ratios and their inverse. A sample program exercising GRATIO...
  • ncg

  • Referenced in 3 articles [sw12413]
  • inverse and the noncentrality parameter. The noncentral gamma distribution can be viewed as a generalization ... Poisson density function with a incomplete gamma function. The noncentral gamma distribution is not available ... propose an algorithm for the noncentral gamma by combining the method originally proposed ... function, density function, quantiles and noncentrality parameter of the noncentral incomplete gamma and its particular...
  • mlrnd

  • Referenced in 36 articles [sw20908]
  • Mittag–Leffler random number generator. Matlab function mlrnd. Returns a matrix of IID random numbers ... index (or exponent) beta and scale parameter gamma_t. The size of the returned matrix...
  • GAMINV

  • Referenced in 2 articles [sw24354]
  • FORTRAN subroutines for computing the incomplete gamma function ratios and their inverse. The FORTRAN subroutines ... computing the incomplete gamma function ratios and their inverse. A sample program exercising GRATIO...
  • Algorithm 939

  • Referenced in 7 articles [sw12897]
  • described. These functions appear in problems of different technical and scientific areas such ... square or the noncentral gamma cumulative distribution functions. The algorithm for computing the Marcum functions...
  • weightedScores

  • Referenced in 7 articles [sw12457]
  • parametrization with probability mass function f(y; tau, xi) = Gamma(tau + y) xi^y / [ Gamma ... gamma. In NB1, the convolution parameter tau is a function of the covariate...
  • Algorithm 1006

  • Referenced in 1 article [sw35939]
  • accurate evaluation of a generalized incomplete gamma function. We present a computational procedure to evaluate ... upper (y=+∞) incomplete gamma functions. To allow for large values ... classical ratio with the complete gamma function. The generalized incomplete gamma function is estimated with...