Su, Jen-Je; Nguyen, Jeremy K. - In: Economics Letters 121 (2013) 1, pp. 8-11
Two alternatives to Enders and Lee’s (2012a,b) Fourier unit root testing strategy, which incorporates pretesting for nonlinearity, are considered. One is based on the union of rejection (UR) approach, and the other is a hybrid strategy that combines the UR approach with the use of extra...