Kapetanios, George; Shin, Yongcheol - In: Economics Letters 100 (2008) 3, pp. 377-380
We extend GLS detrending procedure to testing for unit roots against STAR and SETAR alternatives. Monte Carlo simulations and applications to DM/Yen real exchange rates demonstrate that GLS detrending-based nonlinear unit root tests are more powerful than OLS detrending-based counterparts.