The aim of this article is to develop a unit root test that takes into account two sources of nonlinearites in data, i.e. asymmetric speed of mean reversion and structural changes. The asymmetric speed of mean reversion is modelled by means of a exponential smooth transition autoregression...

The aim of this article is to analyse the empirical fulfilment of purchasing power parity (PPP) in a number of Central and Eastern European countries. For this purpose we apply two different unit root tests in order to control for two sources of nonlinearities, i.e. Bierens (1997) and Kapetanios...