logistf

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) <doi:10.1002/sim.1047>. 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 et al (2017) <doi:10.1002/sim.7273>.

Last 30 days

This package has been downloaded 9,169 times in the last 30 days. A solid achievement! Enough downloads to get noticed at department meetings. The following heatmap shows the distribution of downloads per day. Yesterday, it was downloaded 216 times.

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Last 365 days

This package has been downloaded 89,101 times in the last 365 days. This work is reaching a lot of screens. A significant achievement indeed! The day with the most downloads was May 10, 2024 with 5,436 downloads.

The following line graph shows the downloads per day. You can hover over the graph to see the exact number of downloads per day.