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A Variance‐Ratio Test of Random Walks in Foreign Exchange Rates

A Variance‐Ratio Test of Random Walks in Foreign Exchange Rates ABSTRACT The separate variance‐ratio tests under homoscedasticity and heteroscedasticity both provide evidence rejecting the random walk hypothesis, using five pairs of weekly nominal exchange rate series over the period from August 7, 1974 to March 29, 1989. The rejections cast doubt on the random walk hypothesis in exchange rates, which has received support in the existing literature. Furthermore, since the rejections are robust to heteroscedasticity, they suggest autocorelations of weekly increments in the nominal exchange rate series, which may be consistent with the exchange rate overshooting or undershooting phenomenon. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Finance Wiley

A Variance‐Ratio Test of Random Walks in Foreign Exchange Rates

The Journal of Finance , Volume 46 (2) – Jun 1, 1991

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References (27)

Publisher
Wiley
Copyright
1991 The American Finance Association
ISSN
0022-1082
eISSN
1540-6261
DOI
10.1111/j.1540-6261.1991.tb02686.x
Publisher site
See Article on Publisher Site

Abstract

ABSTRACT The separate variance‐ratio tests under homoscedasticity and heteroscedasticity both provide evidence rejecting the random walk hypothesis, using five pairs of weekly nominal exchange rate series over the period from August 7, 1974 to March 29, 1989. The rejections cast doubt on the random walk hypothesis in exchange rates, which has received support in the existing literature. Furthermore, since the rejections are robust to heteroscedasticity, they suggest autocorelations of weekly increments in the nominal exchange rate series, which may be consistent with the exchange rate overshooting or undershooting phenomenon.

Journal

The Journal of FinanceWiley

Published: Jun 1, 1991

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