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Testing the fractional integration parameter revisited: a fractional Dickey-Fuller test

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  • Ahmed Bensalma

Abstract

The main scope of this paper is to provide how to extend the standard Dickey-Fuller test (1979) by taking into account the fractional case. Such extension has already been discussed by Dolado et al. (2002). In this paper, we show, in the first step, that the fractional Dickey-Fuller test proposed by Dolado et al. is useless in practice. In the second step we show how to extend adequately the standard framework of Dickey-Fuller test to take into account the fractional case by using the usual test statistics and the usual asymptotic distributions (Phillips, 1987). Such extension can be very useful in practice. Through a simulation study, we show the good performance of the test in terms of size and power. Finally, in order to show how to use the new testing procedure, the test is applied to the well-known Nelson and Plosser data.

Suggested Citation

  • Ahmed Bensalma, 2018. "Testing the fractional integration parameter revisited: a fractional Dickey-Fuller test," International Journal of Mathematics in Operational Research, Inderscience Enterprises Ltd, vol. 12(4), pages 471-506.
    • Handle: RePEc:ids:ijmore:v:12:y:2018:i:4:p:471-506
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