detectseparation

0.4.0

Detect and Check for Separation and Infinite Maximum Likelihood Estimates

4packages depend

51.3Kdownloads / year

89.3%test coverage

9/13checks pass

Overview

About

Maintained by Ioannis KosmidisFirst published 2020-03-254 releasesCRAN page ↗GitHub ↗

Provides pre-fit and post-fit methods for detecting separation and infinite maximum likelihood estimates in generalized linear models with categorical responses. The pre-fit methods apply on binomial-response generalized liner models such as logit, probit and cloglog regression, and can be directly supplied as fitting methods to the glm() function. They solve the linear programming problems for the detection of separation developed in Konis (2007, https://ora.ox.ac.uk/objects/uuid:8f9ee0d0-d78e-4101-9ab4-f9cbceed2a2a) using 'ROI' https://cran.r-project.org/package=ROI or 'lpSolveAPI' https://cran.r-project.org/package=lpSolveAPI. The post-fit methods apply to models with categorical responses, including binomial-response generalized linear models and multinomial-response models, such as baseline category logits and adjacent category logits models; for example, the models implemented in the 'brglm2' https://cran.r-project.org/package=brglm2 package. The post-fit methods successively refit the model with increasing number of iteratively reweighted least squares iterations, and monitor the ratio of the estimated standard error for each parameter to what it has been in the first iteration. According to the results in Lesaffre & Albert (1989, https://www.jstor.org/stable/2345845), divergence of those ratios indicates data separation.

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("detectseparation", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("ikosmidis/detectseparation")

Development version from ikosmidis/detectseparation. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-detectseparation

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-detectseparation

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-detectseparation

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

4NOTE9OK

Failing flavors

NOTE r-devel-linux-x86_64-debian-clang
NOTE r-devel-linux-x86_64-debian-gcc
NOTE r-devel-linux-x86_64-fedora-gcc
NOTE r-devel-windows-x86_64

Slowest check: 1.7 min · r-devel-linux-x86_64-fedora-clang

Code health

Yes

Tests · ratio 0.00

89.3%

Coverage · measured lines

100%

Documentation · exports

Dependencies · direct

Check history

NOTE2026-07-16
11 OK · 2 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 902 wordsVignettesYes · dynamicpkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 100%
Documented parameters: 100%
Return-value docs: 50%
References docs: 67%

Downloads

51.3K

CRAN downloads in the past year

Rank #1,858 · ~141/day · ~4.3K/mo

Releases R versions

Daily download trend is not available in this view yet.

3K30 days

13.9K90 days

51.3K1 year

Compare downloads with other packages →

Also on192 r2u22 autocran1.2K conda_forge

Repository

GitHub ↗ ikosmidis/detectseparation

7Stars

1Forks

3Open issues

0Open PRs

4Releases

195Commits

5Contributors

195 commits · Last activity 2026-04-29

Stars over time

2025-03-14 · 72026-07-07 · 7

Repository practices

Upstream repositoryBeta

4 development-tooling and community-health practices detected across 4 families in the upstream repository

Checks run against github.com/ikosmidis/detectseparation on 2026-07-19.

Continuous integration (1)

GitHub Actions

Docs source (1)

README.Rmd

Lint, format, editor (1)

RStudio project

Coverage (1)

Codecov

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

14 external dependencies (excludes base and recommended)

Depends (1)

R >= 3.3.0

Imports (4)

ROI ROI.plugin.lpsolve lpSolveAPI pkgload

LinkingTo (0)

none

Suggests (10)

knitr rmarkdown covr brglm2 AER tinytest ROI.plugin.ecos ROI.plugin.glpk ROI.plugin.alabama ROI.plugin.neos

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

4direct

0indirect

metadeconfoundR corncob plotor brglm2

Code & Tests

Code Composition

R 1,231 (49%)Rd 784 (31%)Vignettes 393 (16%)Other 110 (4%)

Code characteristics

Object systems

S34

Cyclomatic complexity: 3.0 median / 22 max
Test cases: 64 / 0.00 per code line

Test coverage

Line coverage

89%

Expression

87.4%

Tests / Examples

89.3% / 62% ex

Functions

14 4 exported

Complexity

5.3 avg / 22 max

Call network

14 nodes / 4 edges

Call graph

Open call graph →

Loading call graph…

Lowest coverage

14 functions

Function	Cyclo	Coverage
plot.inf_check	1	0%
print.detect_infinite_estimates	3	0%
check_infinite_estimates.glm	6	69%
.detect_infinite_estimates	14	92%
print.detect_separation	5	93%
separation_type_ROI	3	93%

Datasets

Bundled datasets · 3

Name	Class	Rows × Cols	Also ships in
endometrial	data.frame	79 × 4	in 6 packages
lizards	data.frame	23 × 6	in 3 packages
silvapulle1981	data.frame	35 × 2	–

People & History

People (4)

Maintainer (1)

Ioannis Kosmidis

Author, Maintainer

Authors (3)

Ioannis Kosmidis

Author, Maintainer

Dirk Schumacher

Author

Florian Schwendinger

Author · added in 0.3

Contributors (1)

Kjell Konis

Contributor

Package Timeline

4 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
0.4.0Latest
2026-04-19 · current release · diff ↗
R
R 4.5.0 released · 2025-04-11
R
R 4.4.0 released · 2024-04-24
R
R 4.3.0 released · 2023-04-21
0.3
2022-08-26 · diff ↗
R
R 4.2.0 released · 2022-04-22
R
R 4.1.0 released · 2021-05-18
0.2
2021-04-22 · diff ↗
R
R 4.0.0 released · 2020-04-24
0.1
2020-03-25
R
R 3.6.0 released · 2019-04-26

Package metadata

First published: 2020-03-25
Total releases: 4 / 6 yrs
License: GPL-3 OSI
Minimum R: ≥ 3.3.0
Bundled data: 1.2 KB / 3 files
Download size: 104 KB
Installed size: not tracked yet
With dependencies: not tracked yet

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