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detectseparation  

Detect and Check for Separation and Infinite Maximum Likelihood Estimates
View on CRAN: Click here


Download and install detectseparation package within the R console
Install from CRAN:
install.packages("detectseparation")

Install from Github:
library("remotes")
install_github("cran/detectseparation")

Install by package version:
library("remotes")
install_version("detectseparation", "0.3")



Attach the package and use:
library("detectseparation")
Maintained by
Ioannis Kosmidis
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2020-03-25
Latest Update: 2022-08-26
Description:
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, ) using 'ROI' or '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' 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, ), divergence of those ratios indicates data separation.
How to cite:
Ioannis Kosmidis (2020). detectseparation: Detect and Check for Separation and Infinite Maximum Likelihood Estimates. R package version 0.3, https://cran.r-project.org/web/packages/detectseparation. Accessed 15 Sep. 2026.
Previous versions and publish date:
(2026-07-09 07:31), 0.1 (2020-03-25 17:00), 0.2 (2021-04-22 17:00), 0.3 (2022-08-26 23:04)
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