The structure of the quasi-score function is investigated when the data is a realization of a 1-dependent and stationary sequence of random variables. A truncated quasi-score function is proposed, which leads to a simplified quasi-score without loss of efficiency.

We analyze the empirical effects of different measures of labor standards on the export performance of the United States using annual data for the period 1950-1998, applying a time series approach based on the structural change literature. Hence, we estimate a model with endogenous breaks...

This note shows that German real GDP follows a trendstationary process. Both tests which have trendstationarity as the alternative hypothesis as well as tests that have it under the null hypothesis prefer the trendstationary model. Explicit consideration of breaks in the trend is not necessary...

We consider the momentum threshold autoregressive (MTAR) process and characterize the region of the autoregressive coefficients for geometric ergodicity. The region is a proper subset of the ergodic region of the TAR process. We show that the process is geometrically ergodic inside the region...