Kim, Belaire-Franch and Amador ["Journal of Econometrics" (2002) Vol. 109, pp. 389-392] and Busetti and Taylor ["Journal of Econometrics" (2004) Vol. 123, pp. 33-66] present different percentiles for the same mean score test statistic. We find that the difference by a factor 0.6 is due to...

We estimate a linear and a piecewise linear Phillips curve model with regional labor market data for West German and Neue Länder. Employing regional observations allows us to country difference the data. This eliminates, under the assumption of homogeneous Länder, supply shocks and changes in...

The authors examine monthly inflation rates of five industrial countries. The application of tests against stationarity as well as tests against a unit root yield contradictory results. Thus, fractional integration allowing for long memory is a plausible model. The authors discuss and apply the...

We consider regressions of nonstationary fractionally integrated variables dominated by linear time trends. The regression errors can be short memory, long memory, or even nonstationary, and hence allow for a very flexible cointegration model. Our main contributions are two: First, we analyze...