Fractional cointegration in a trivariate model is used to test the lon
g-run purchasing power parity hypothesis in four Asian newly industria
lized economies. Critical values for the Geweke-Porter-Hudak tests bas
ed on Monte Carlo simulations are provided. Evidence of fractional coi
ntegration arises when a linear trend is included. Subperiod analysis
indicates that a shift in the exchange rate regime is likely to affect
the results of cointegration tests.