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fitdistrplus extends the fitdistr() function (of the MASS package) with several functions to help the fit of a parametric distribution to non-censored or censored data. Censored data may contain left censored, right censored and interval censored values, with several lower and upper bounds. In addition to maximum likelihood estimation (MLE), the package provides moment matching (MME), quantile matching (QME) and maximum goodness-of-fit estimation (MGE) methods (available only for non-censored data). Weighted versions of MLE, MME and QME are available.

The package

The stable version of fitdistrplus can be installed from CRAN using:


The development version of fitdistrplus can be installed from GitHub (remotes needed):

if (!requireNamespace("remotes", quietly = TRUE))

Finally load the package in your current R session with the following R command:


Three vignettes are attached to the fitdistrplus package:

Authors & Contacts

Issues can be reported on


If you use fitdistrplus, you should cite:
Marie Laure Delignette-Muller, Christophe Dutang (2015). fitdistrplus: An R Package for Fitting Distributions. Journal of Statistical Software. DOI 10.18637/jss.v064.i04.