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The variance ratio and trend stationary model as extensions of a constrained autoregressive model


  • Shlomo Zilca

    (Faculty of Management, Tel Aviv University, Tel Aviv, Israel)


This paper shows that a constrained autoregressive model that assigns linearly decreasing weights to past observations of a stationary time series has important links to the variance ratio methodology and trend stationary model. It is demonstrated that the proposed autoregressive model is asymptotically related to the variance ratio through the weighting schedules that these two tools use. It is also demonstrated that under a trend stationary time series process the proposed autoregressive model approaches a trend stationary model when the memory of the autoregressive model is increased. These links create a theoretical foundation for tests that confront the random walk model simultaneously against a trend stationary and a variety of short- and long-memory autoregressive alternatives. Copyright © 2009 John Wiley & Sons, Ltd.

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  • Shlomo Zilca, 2010. "The variance ratio and trend stationary model as extensions of a constrained autoregressive model," Journal of Forecasting, John Wiley & Sons, Ltd., vol. 29(5), pages 467-475.
  • Handle: RePEc:jof:jforec:v:29:y:2010:i:5:p:467-475 DOI: 10.1002/for.1137

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    References listed on IDEAS

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