The IMF Working Papers series is designed to make IMF staff research available to a wide audience. Almost 300 Working Papers are released each year, covering a wide range of theoretical and analytical topics, including balance of payments, monetary and fiscal issues, global liquidity, and national and international economic developments.
This paper addresses several questions about the time series processes followed by dollar exchange rates. The stochastic process for exchange rates implied by structural models and the conditions under which they would be described by random walks are examined. Tests on the univariate time series for dollar exchange rates are undertaken to determine if there is evidence for departures from a random walk. Multivariate tests examine whether longer-run movements in the dollar are linked to those in other economic variables, and whether deviations from these long-run relationships contain information for predicting exchange rate movements.