IDEAS home Printed from https://ideas.repec.org/a/jof/jforec/v21y2002i3p207-23.html
   My bibliography  Save this article

Unit Roots versus Other Types of Time Heterogeneity, Parameter Time Dependence and Superexogeneity

Author

Listed:
  • Caporale, Guglielmo Maria
  • Pittis, Nikitas

Abstract

This paper stresses the restrictive nature of the standard unit root/cointegration assumptions and examines a more general type of time heterogeneity, which might characterize a number of economic variables, and which results in parameter time dependence and misleading statistical inference. We show that in such cases "operational" models cannot be obtained, and the estimation of time-varying parameter models becomes necessary. For instance, economic processes subject to endemic change can only be adequately modelled in a state space form. This is a very important point, because unstable models will break down when used for forecasting purposes. We also discuss a new test for the null of cointegration developed by Quintos and Phillips (1993), which is based on parameter constancy in cointegrating regressions. Finally, we point out that, if it is possible to condition on a subset of superexogenous variables, parameter instability can be handled by estimating a restricted system. Copyright © 2002 by John Wiley & Sons, Ltd.

Suggested Citation

  • Caporale, Guglielmo Maria & Pittis, Nikitas, 2002. "Unit Roots versus Other Types of Time Heterogeneity, Parameter Time Dependence and Superexogeneity," Journal of Forecasting, John Wiley & Sons, Ltd., vol. 21(3), pages 207-223, April.
    • Handle: RePEc:jof:jforec:v:21:y:2002:i:3:p:207-23
    as

    Download full text from publisher

    To our knowledge, this item is not available for download. To find whether it is available, there are three options:
    1. Check below whether another version of this item is available online.
    2. Check on the provider's web page whether it is in fact available.
    3. Perform a search for a similarly titled item that would be available.

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Guglielmo Maria Caporale & Christoph Hanck, 2009. "Cointegration tests of PPP: do they also exhibit erratic behaviour?," Applied Economics Letters, Taylor & Francis Journals, vol. 16(1), pages 9-15.
    2. Costas Anyfantakis & Guglielmo Maria Caporale & Nikitas Pittis, 2008. "Parameter instability and forecasting performance: a Monte Carlo study," International Journal of Business Forecasting and Marketing Intelligence, Inderscience Enterprises Ltd, vol. 1(1), pages 1-20.
    3. Guglielmo Maria Caporale & Andros Gregoriou, 2009. "Non-normality, heteroscedasticity and recursive unit root tests of PPP: solving the PPP puzzle?," Applied Economics Letters, Taylor & Francis Journals, vol. 16(3), pages 223-226.
    4. Caporale, Guglielmo Maria & Pittis, Nikitas & Sakellis, Panayiotis, 2003. "Testing for PPP: the erratic behaviour of unit root tests," Economics Letters, Elsevier, vol. 80(2), pages 277-284, August.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:jof:jforec:v:21:y:2002:i:3:p:207-23. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Wiley-Blackwell Digital Licensing or Christopher F. Baum (email available below). General contact details of provider: http://www3.interscience.wiley.com/cgi-bin/jhome/2966 .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.