In this paper we extend the large-sample results provided for the augmented Dickey–Fuller test by Said and Dickey (<xref>1984</xref>, <italic>Biometrika</italic> 71, 599–607) and Chang and Park (<xref>2002</xref>, <italic>Econometric Reviews</italic> 21, 431–447) to the case of the augmented seasonal unit root tests of Hylleberg, Engle, Granger,...

Is In this paper we provide a detailed analysis of the impact of persistent cycles on the well-known semi-parametric unit root tests of Phillips and Perron (1988, Biometrika 75, 335.346). It is shown analytically and through Monte Carlo simulations that the presence of complex (near) unit roots...

We analyze the asymptotic distributions associated with the seasonal unit root tests of the Hylleberg et al. (1990) procedure for quarterly data when the innovations follow a moving average process. Although both the t- and F-type tests suffer from scale and shift effects compared with the...

Forecast combination methodologies exploit complementary relations between different types of econometric models and often deliver more accurate forecasts than the individual models on which they are based. This paper examines forecasts of seasonally unadjusted monthly industrial production data...

Estimating the micro-founded New Keynesian Phillips Curve using rational inflation expectation proxies has often found that the output gap is not a valid measure of inflation pressure. This paper investigates the empirical success of the NKPC in explaining US inflation, using observed measures...