# HADRILM: Stata module to perform Hadri panel unit root test

*Christopher Baum* ()

Statistical Software Components from Boston College Department of Economics

**Abstract:**
hadrilm performs a test for stationarity in heterogeneous panel data (Hadri, 2000). This Lagrange Multiplier (LM) test has a null of stationarity, and its test statistic is distributed as standard normal under the null. The series may be stationary around a deterministic level, specific to the unit (i.e. a fixed effect) or around a unit-specific deterministic trend. The error process may be assumed to be homoskedastic across the panel, or heteroskedastic across units. The residual-based test is based on the squared partial sum process of residuals from a demeaning (detrending) model of level (trend) stationarity. This is version 1.0.3 of the software. Users of Stata 11+ should use the official xtunitroot hadri command.

**Language:** Stata

**Requires:** Stata version 7.0

**Keywords:** panel data; stationarity; unit roots (search for similar items in EconPapers)

**Date:** 2001-07-10, Revised 2003-04-08

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

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**Downloads:** (external link)

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

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

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**Persistent link:** http://EconPapers.repec.org/RePEc:boc:bocode:s419701

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Series data maintained by Christopher F Baum ().