Pesaran, M.H.; Smith, R.P.; Yamagata, T.; Hvozdyk, L. - 2009
Given nominal exchange rates and price data on N + 1 countries indexed by i = 0,1,2,…, N, the standard procedure for testing purchasing power parity (PPP) is to apply unit root or stationarity tests to N real exchange rates all measured relative to a base country, 0, often taken to be the U.S....