This paper considers a multivariate extension of the test for neglected nonlinearity proposed by Tsay (1986) that uses principal components to overcome the problem of dimensionality that is common with tests of this type. Monte Carlo experiments reveal that the modified multivariate test...

This paper evaluates Czech economic development during 2001 and is supplemented by the predictions of basic economic indicators for 2002 and 2003. This article is divided in several parts. In the beginning we focus on economic growth, including a marginal analysis of GDP and industrial...

This paper evaluates Czech economic development during 2001 and is supplemented by the predictions of basic economic indicators for 2002 and 2003. This article is divided in to several specific parts. In the beginning we focus on economic growth, including a marginal analysis of GDP and...

This paper considers regression-based test criteria for the hypothesis of conditional variance nonstationary in the logarithmic family of GARCH processes. The tests are based on teh ARMA representations that appropriate nonlinear transformations of GARCH-type processes admit. Simulation...

In this paper we propose a contemporaneous threshold multivariate smooth transition autoregressive (C-MSTAR) model in which the regime weights depend on the ex ante probabilities that latent regime-specific variables exceed certain threshold values. The model is a multivariate generalization of...

This paper proposes a Bayesian extension of Svensson's (1991) test of target zone credibility. The credibility measures considered allow us to quantify the target zone's overall credibility at each point in time as well as a measure of long-run credibility. In an application of the new...

This paper considers the problem of testing for thepresence of unit autoregressive roots in time series with seasonal components that are arbitrarily close to being deterministic. In particular, the performance of several test criteria for seasonal and non-seasonal unit autoregressive roots is...