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The Properties of Procedures Dealing with Uncertainty about Intercept and Deterministic Trend in Unit Root Testing
Jönköping University, Jönköping International Business School, JIBS, Economics.ORCID iD: 0000-0002-0864-0980
UAE University.
2010 (English)Report (Other academic)
Abstract [en]

The classic Dickey-Fuller unit-root test can be applied using three different equations, depending upon the inclusion of a constant and/or a time trend in the regression equation. This paper investigates the size and power properties of a unit-root testing strategy outlined in Enders (2004), which allows for repeated testing of the unit root with the three equations depending on the significance of various parameters in the equations. This strategy is similar to strategies suggested by others for unit root testing. Our Monte Carlo simulation experiments show that serious mass significance problems prevail when using the strategy suggested by Enders. Excluding the possibility of unrealistic outcomes and using a priori information on whether there is a trend in the underlying time series, as suggested by Elder and Kennedy (2001), reduces the mass significance problem for the unit root test and improves power for that test. Subsequent testing for whether a trend exists is seriously affected by testing for the unit root first, however.

Place, publisher, year, edition, pages
Stockholm,Sweden: Centre of Excellence for Science and Innovation Studies, The Royal Institute of Technology. , 2010. , p. 19
Series
CESIS Electronic Working Paper Series ; 214
Keywords [en]
Unit Roots, Deterministic Components, Model Selection
National Category
Economics
Identifiers
URN: urn:nbn:se:hj:diva-12138OAI: oai:DiVA.org:hj-12138DiVA, id: diva2:319210
Available from: 2010-05-15 Created: 2010-05-15 Last updated: 2020-09-11Bibliographically approved

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http://cesis.abe.kth.se/documents/CESISWP214.pdf

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Hacker, R Scott

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