Practitioners are generally well aware of the fact that most standard approaches for estimation and inference in panel data regressions are based on assuming that the cross-sectional units are independent of each other, an assumption that is surely mistaken in applications, especially in...

In a recent paper Pedroni and Yao (2006) present strong evidence suggesting that Chinese regional output is diverging, a result that flies in the face of the current opinion of Chinese policymakers. This paper provides an in-depth analysis of the reasoning behind this finding. Our main result is...

The few panel data tests for predictability of returns that exist are based on the prerequisite that both the number of time series observations, T, and the number of crosssection units, N, are large. As a result, these tests are impossible for stock markets where lengthy time series data are...