Harvey, David; Leybourne, Stephen J.; Taylor, A. M. Robert - University <Nottingham> / Department of Economics - 2006
practical usefulness of our proposed tests.
Keywords: Broken trend; power envelope; unit root; stationarity tests.
JEL Classi …-modelled trend breaks also cause spurious rejections in stationarity tests, such as
that of Kwiatkowski et al. (1990)[KPSS, hereafter … tests on the parameters of the trend function and unit root/stationarity
tests, as might also be expected in the light of …