Abstract
We derive the asymptotic distribution of the sample autocor-relations of nonstationary fractionally integrated processes of order d. If d≥1, the sample autocorrelations approach their probability limit one with a rate equal to the sample size. If d<1, the rate is slower and depends on d. These findings carry over to the case of detrended series. Monte Carlo evidence and an empirical example illustrate the theoretical results.
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Anderson, O.D. (1992): Partial Autocorrelation Properties for Non-Stationary Autoregressive Moving-Average Models; Journal of Time Series Analysis 13, 486–500.
Bierens, H.J. (1993): Higher-Order Sample Autocorrelations and the Unit Root Hypothesis; Journal of Econometrics 57, 137–160.
Cheung, Y.-W. (1993): Long Memory in Foreign-Exchange Rates; Journal of Business & Economic Statistics 11, 93–101.
Davydov, Y.A. (1970): The Invariance Principle for Stationary Processes; Theory of Probability and Its Applications 15, 487–489.
Dickey, D.A. and W.A. Fuller (1979): Distribution of the Estimators for Autoregressive Time Series with a Unit Root; Journal of the American Statistical Association 74, 427–431.
Diebold, F.X. and G.D. Rudebusch (1989): Long Memory and Persistence in Aggregate Output; Journal of Monetary Economics 24, 189–209.
Diebold, F.X., S. Husted, and M. Rush (1991): Real Exchange Rates under the Gold Standard; Journal of Political Economy 99, 1252–1271.
Durlauf, S.N. and P.B.C. Phillips (1988): Trends versus Random Walks in Time Series Analysis; Econometrica 56, 1333–1354.
Granger, C.W.J. and R. Joyeux (1980): An Introduction to Long-Memory Time Series Models and Fractional Differencing; Journal of Time Series Analysis 1, 15–29.
Hamilton, J.D. (1994): Time Series Analysis; Princeton University Press.
Hassler, U. (1994): The Sample Autocorrelation Function of I(1) processes; Statistical Papers 35, 1–16.
Hassler, U. and Wolters, J. (1994): On the Power of Unit Root Tests Against Fractional Alternatives; Economics Letters 45, 1–5.
Hassler, U. and Wolters, J. (1995): Long Memory in Inflation Rates: International Evidence; Journal of Business & Economic Statistics 13, 37–45.
Hasza, D.P. (1980): The Asymptotic Distribution of the Sample Autocorrelations for an Integrated ARMA process; Journal of the American Statistical Association 75, 349–352.
Hosking, J.R.M. (1981): Fractional Differencing; Biometrika 68, 165–176.
Hosking, J.R.M. (1984): Asymptotic Distributions of the Sample Mean, Autocovariances and Autocorrelations of Long-Memory Time Series; Mathematics Research Center Technical Summary Report #2752, University of Wisconsin-Madison.
Hosking, J.R.M. (1984a): Modelling Persistence in Hydrologic Time Series using Fractional Differencing; Water Resources Research 20, 1898–1908.
Lo, A.W. (1991): Long-Term Memory in Stock Market Prices; Econometrica 59, 1279–1313.
Mandelbrot, B.B. and J.W. Van Ness (1968): Fractional Brownian Motions, Fractional Brownian Noises and Applications; SIAM Review 10, 422–437.
Newbold, P. and Ch. Agiakloglou (1993): Bias in the Sample Autocorrelations of Fractional Noise; Biometrika 80, 698–702.
Park, J.Y. and P.C.B. Phillips (1998): Statistical Inference in Regressions with Integrated Processes: Part I; Econometric Theory 4, 468–497.
Phillips, P.C.B. (1987): Time Series Regression with a Unit Root; Econometrica 55, 277–301.
Sowell, F. (1990): The Fractional Unit Root Distribution; Econometrica 58, 495–505.
Taqqu, M. (1975): Weak Convergence to Fractional Brownian Motion and to the Rosenblatt Process; Zeitschrift für Wahrscheinlichkeit und verwandte Gebiete 31, 287–302.
Wichern, D.W. (1973): The Behaviour of the Sample Autocorrelation Function for an Integrated Moving Average Process; Biometrika 60, 235–239.
Yajima, Y. (1985): Asymptotic Properties of the Sample Autocorrelations and Partial Autocorrelations of a Multiplicative ARIMA Process; Journal of Time Series Analysis 6, 187–201.
Yajima, Y. (1988): On Estimation of a Regression Model with Long-Memory Stationary Errors; Annals of Statistics 16, 791–807.
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Hassler, U. Sample autocorrelations of nonsationary fractionally integrated series. Statistical Papers 38, 43–62 (1997). https://doi.org/10.1007/BF02925214
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DOI: https://doi.org/10.1007/BF02925214