Firth's Bias-Reduced Logistic Regression

Fit a logistic regression model using Firth's bias reduction method, equivalent to penalization of the log-likelihood by the Jeffreys prior. Confidence intervals for regression coefficients can be computed by penalized profile likelihood. Firth's method was proposed as ideal solution to the problem of separation in logistic regression, see Heinze and Schemper (2002) . If needed, the bias reduction can be turned off such that ordinary maximum likelihood logistic regression is obtained. Two new modifications of Firth's method, FLIC and FLAC, lead to unbiased predictions and are now available in the package as well, see Puhr, Heinze, Nold, Lusa and Geroldinger (2017) .


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1.24 by Georg Heinze, 10 days ago

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Authors: Georg Heinze [aut, cre] , Meinhard Ploner [aut] , Daniela Dunkler [ctb] , Harry Southworth [ctb] , Lena Jiricka [aut]

Documentation:   PDF Manual  

Task views: Statistics for the Social Sciences

GPL license

Imports mice, mgcv,

Imported by AUtests, Surrogate, apricom, pogit.

Depended on by mDAG.

Suggested by ggeffects, insight, metamisc, phyr.

Enhanced by MuMIn.

See at CRAN