Cavaliere, Giuseppe; Taylor, A. M. Robert - In: Econometric Reviews 28 (2009) 4, pp. 364-371
In a recent article, Xiao and Lima (2007) show numerically that the stationarity test of Kwiatkowski et al. (1992) has …-varying volatility. We also propose alternative tests of covariance stationarity which we show to improve upon the power properties of …