# ZOIB: Stata module to fit a zero-one inflated beta distribution by maximum likelihood

*Maarten Buis* ()

Statistical Software Components from Boston College Department of Economics

**Abstract:**
zoib fits by maximum likelihood a zero-one inflated beta distribution to a distribution of a variable depvar. depvar ranges between 0 and 1: for example, it may be a proportion. It will estimate the probabilities of having the value 0 and/or 1 as separate processes. The logic is that we can often think of proportions of 0 or 1 as being qualitatively different and generated through a different process as the other proportions.

**Language:** Stata

**Requires:** Stata version 8.2

**Keywords:** compositional data; zero; one; proportion (search for similar items in EconPapers)

**Date:** 2010-05-30, Revised 2012-08-08

**Note:** This module should be installed from within Stata by typing "ssc install zoib". Windows users should not attempt to download these files with a web browser.

**References:** Add references at CitEc

**Citations** View citations in EconPapers (3) Track citations by RSS feed

**Downloads:** (external link)

http://fmwww.bc.edu/repec/bocode/z/zoib.ado program code (text/plain)

http://fmwww.bc.edu/repec/bocode/z/zoib.hlp help file (text/plain)

http://fmwww.bc.edu/repec/bocode/z/zoib_postestimation.hlp help file (text/plain)

http://fmwww.bc.edu/repec/bocode/z/zoib_p.ado program code (text/plain)

http://fmwww.bc.edu/repec/bocode/z/zoib_lf.ado program code (text/plain)

http://fmwww.bc.edu/repec/bocode/z/zib_lf.ado program code (text/plain)

http://fmwww.bc.edu/repec/bocode/z/zoib_beta_lf.ado program code (text/plain)

http://fmwww.bc.edu/repec/bocode/o/oib_lf.ado program code (text/plain)

http://fmwww.bc.edu/repec/bocode/k/k401.dta example data file (application/x-stata)

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**Persistent link:** https://EconPapers.repec.org/RePEc:boc:bocode:s457156

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