SSE/EFI Working Paper Series in Economics and Finance 413
In this paper we show the consequences of applying a panel unit root test when testing for a purchasing power parity relationship. The distribution of the tests investigated, including the IPS test of Im et al (1997), are influenced by a common stochastic trend which is usually not accounted for. The result is that the size tends to one with the number of cross-sections.
Dynamic panels Monte Carlo Purchasing power parity