Density, distribution function, quantile function and random generation for the Skellam distribution, the distribution of the difference of two independent Poisson variables (Skellam, 1946), with saddlepoint approximations, maximum likelihood estimation, and a regression model in which both rates depend on covariates. The distribution functions remain accurate for very large rates and far into the tails, on the natural and the log scale.
| Version: | 0.2.5 |
| Imports: | stats |
| Suggests: | knitr, rmarkdown, testthat (≥ 3.0.0) |
| Enhances: | VGAM |
| Published: | 2026-11-09 |
| DOI: | 10.32614/CRAN.package.skellam |
| Author: | Jerry W. Lewis [aut], Patrick E. Brown [aut], Michail Tsagris [aut], Montasser Ghachem [aut, cre], Oguz Ersan [aut] |
| Maintainer: | Montasser Ghachem <mg at pinstimation.com> |
| BugReports: | https://github.com/monty-se/skellam/issues |
| License: | GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |
| URL: | https://monty-se.github.io/skellam/, https://github.com/monty-se/skellam |
| NeedsCompilation: | no |
| Citation: | skellam citation info |
| Materials: | README, NEWS |
| In views: | Distributions |
| CRAN checks: | skellam results |
| Reference manual: | skellam.html , skellam.pdf |
| Vignettes: |
Validating the skellam package (source, R code) |
| Package source: | skellam_0.2.5.tar.gz |
| Windows binaries: | r-devel: skellam_0.2.4.zip, r-release: skellam_0.2.4.zip, r-oldrel: skellam_0.2.4.zip |
| macOS binaries: | r-release (arm64): skellam_0.2.5.tgz, r-oldrel (arm64): skellam_0.2.5.tgz, r-release (x86_64): skellam_0.2.4.tgz, r-oldrel (x86_64): skellam_0.2.4.tgz |
| Old sources: | skellam archive |
| Reverse imports: | PINstimation |
| Reverse suggests: | CCd, extraDistr, fitteR |
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