Current literature reveals that tests of the random walk hypothesis (RWH) on financial prices have focused on major world financial markets. This paper presents results of variance ratio tests of random walks in foreign exchange rates of six African countries. For most currencies analyzed, the...

A nonparametric version of the Final Prediction Error (FPE) is proposed for lag selection in nonlinear autoregressive time series. We derive its consistency for both local constant and local linear estimators using a derived optimal bandwidth. Further asymptotic analysis suggests a greater...