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ExtDist: Extending the Range of Functions for Probability Distributions

A consistent, unified and extensible framework for estimation of parameters for probability distributions, including parameter estimation procedures that allow for weighted samples; the current set of distributions included are: the standard beta, the four-parameter beta, Burr, gamma, Gumbel, Johnson SB and SU, Laplace, logistic, normal, symmetric truncated normal, truncated normal, symmetric-reflected truncated beta, standard symmetric-reflected truncated beta, triangular, uniform, and Weibull distributions; decision criteria and selections based on these decision criteria.

Online version of documentation is available at GitHub Pages.

Notable updates

0.7-1 (2023-01-16)

Long-standing bug in Weibull and gamma distributions was fixed:

  • for gamma distribution, scale parameter was passed as a rate in stats::*gamma calls

  • for Weibull distribution, stats::*gamma was called instead of stats::*weibull

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Install

install.packages('ExtDist')

Monthly Downloads

478

Version

0.7-3

License

GPL (>= 2)

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Maintainer

Oleksii Nikolaienko

Last Published

June 10th, 2025

Functions in ExtDist (0.7-3)

Normal_trunc_ab

The truncated normal distribution.
SRTB_ab

The symmetric-reflected truncated beta (SRTB) distribution.
Normal

The Normal Distribution.
Laplace

The Laplace Distribution.
Uniform

The Uniform Distribution.
Normal_sym_trunc_ab

The symmetric truncated normal distribution.
Logistic

The Logistic Distribution.
SSRTB

The standard symmetric-reflected truncated beta (SSRTB) distribution.
Weibull

The Weibull Distribution.
wmle

Weighted Maximum Likelihood Estimation.
eval.estimation

Parameter Estimation Evaluation.
Triangular

The Triangular Distribution.
eDist

S3 methods for manipulating eDist objects.
compareDist

Compare a sample to one or more fitted distributions
bestDist

Finding the best distribution for a (weighted) sample.
DistSelCriteria

Distribution Selection Criteria.
Gamma

The Gamma Distribution.
ExtDist-package

Extended Probability Distribution Functions
Beta_ab

The four-parameter beta distribution.
Beta

The Standard Beta Distribution.
Exponential

The Exponential Distribution.
Burr

The Burr Distribution.
Gumbel

The Gumbel distribution
JohnsonSB

The Johnson SB distribution.
JohnsonSU

The Johnson SU distribution.