In this paper, we make use of state space models toinvestigate the presence of stochastic trends in economic time series. Amodel is specified where such a trend can enter either in the autoregressiverepresentation or in a separate state equation. Tests based on the formerare analogous to...

This discussion paper resulted in a publication IN the <a HREF="http://people.few.eur.nl/hkvandijk/PDF/Koop_and_Van_Dijk_2000_JoE_testing_for_integration.pdf">'Journal of Econometrics'</a>, 2000, 97(2), 261-291.<p> In this paper, we make use of state space models to investigate the presence of stochastic trends in economic time series. A model is specified where such a trend can enter either in the...</p>

This discussion paper resulted in a publication in <I>Computational Statistics & Data Analysis</I> (2006). Vol. 51, issue 2, pages 885-903.<P> We explore a periodic analysis in the context of unobserved components time series models that decompose time series into components of interest such as trend and...</p></i>

We present an equilibrium-search model with heterogenous workers whosearch for a job in one of two sectors and who lose part of theirskills during unemployment. We show that an import tariff increasethe wage and the employment prospects in the protected sector. Thisresults in a labor market...