Liu, Christina Y; He, Jia - In: Journal of Finance 46 (1991) 2, pp. 773-85
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...