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Long Memory in Foreign-Exchange Rates

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  • Cheung, Yin-Wong
Abstract
Using the Geweke-Porter-Hudak test, the author finds evidence of long memory in exchange-rate data. This implies t hat the empirical evidence of unit roots in exchange rates may not be robust to long-memory alternatives. Fractionally integrated autoregressive moving average models are estimated by both the time-domain exact maximum likelihood method and the frequency-domain approximate maximum likelihood method. Impulse-response functions and forecasts based.on these estimated fractionally integrated autoregressive moving average models are evaluated to gain insight into the long-memory characteristics of exchange rates. Some tentative explanations of the long memory found in the exchange rate s are discussed.

Suggested Citation

  • Cheung, Yin-Wong, 1993. "Long Memory in Foreign-Exchange Rates," Journal of Business & Economic Statistics, American Statistical Association, vol. 11(1), pages 93-101, January.
    • Handle: RePEc:bes:jnlbes:v:11:y:1993:i:1:p:93-101
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