static panel models. Thirdly, via scatter diagrams of cross section specific estimates we observe a different time evolution …

performance of homogenous panel unit root tests in the presence of permanent volatility shifts. It is shown that in this case …, panel unit root tests derived under time invariant innovation variances lose control over actual significance levels while … hypothesis. -- Panel unit root tests ; variance breaks ; cross sectional dependence ; Fisher hypothesis …

In this dissertation new test statistics for the (panel) unit root hypothesis are presented. Besides a novel approach …

not invariant with respect to the investigated sample period. -- Purchasing power parity ; Panel cointegration ; Wild …