Often applied econometricians are faced with working with data that is less than ideal. The data may be observed with gaps in it, a model may suggest variables that are observed at different frequencies, and sometimes econometric results are very fragile to the inclusion or omission of just a...

Empirische Analysen mit Paneldaten sind aus der wirtschafts- und sozialwissenschaftlichen Forschung seit Beginn der 80er Jahren nicht mehr wegzudenken. Die Beliebtheit resultiert unter anderem aus der Möglichkeit, mithilfe von Paneldaten unbeobachtete Unterschiede zwischen den...

In this paper, we propose Phillips-Perron type, semiparametric testing procedures to distinguish a unit root process from a mean-reverting exponential smooth transition autoregressive one. The limiting nonstandard distributions are derived under very general conditions and simulation evidence...