brglm2: Bias Reduction in Generalized Linear Models

Estimation and inference from generalized linear models based on various methods for bias reduction. The 'brglmFit' fitting method can achieve reduction of estimation bias by solving either the mean bias-reducing adjusted score equations in Firth (1993) <doi:10.1093/biomet/80.1.27> and Kosmidis and Firth (2009) <doi:10.1093/biomet/asp055>, or the median bias-reduction adjusted score equations in Kenne et al. (2016) <arXiv:1604.04768>, or through the direct subtraction of an estimate of the bias of the maximum likelihood estimator from the maximum likelihood estimates as in Cordeiro and McCullagh (1991) <>. Estimation in all cases takes place via a quasi Fisher scoring algorithm, and S3 methods for the construction of of confidence intervals for the reduced-bias estimates are provided. In the special case of generalized linear models for binomial and multinomial responses, the adjusted score approaches return estimates with improved frequentist properties, that are also always finite, even in cases where the maximum likelihood estimates are infinite (e.g. complete and quasi-complete separation). 'brglm2' also provides pre-fit and post-fit methods for detecting separation and infinite maximum likelihood estimates in binomial response generalized linear models.

Version: 0.1.4
Depends: R (≥ 3.3.0)
Imports: MASS, stats, Matrix, graphics, nnet, enrichwith, lpSolveAPI
Suggests: testthat, knitr, rmarkdown
Published: 2017-05-23
Author: Ioannis Kosmidis [aut, cre], Kjell Konis [ctb], Euloge Clovis Kenne Pagui [ctb], Nicola Sartori [ctb]
Maintainer: Ioannis Kosmidis <i.kosmidis at>
License: GPL-2 | GPL-3
NeedsCompilation: yes
Citation: brglm2 citation info
Materials: README NEWS
CRAN checks: brglm2 results


Reference manual: brglm2.pdf
Vignettes: Bias reduction in generalized linear models
Detecting separation and infinite estimates in binomial response GLMs
Package source: brglm2_0.1.4.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
OS X El Capitan binaries: r-release: brglm2_0.1.3.tgz
OS X Mavericks binaries: r-oldrel: brglm2_0.1.3.tgz
Old sources: brglm2 archive


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