It is a well-known property that standard GMM estimators for dynamic panel data might perform poorly in small samples. Several papers have noted this to be especially true for the estimated standard errors, which are normally biased downwards. The aim of the present paper is to compare how two...

In this paper we propose tests for hypothesis regarding the parameters of a the deterministic trend function of a univariate time series. The tests do not require knowledge of the form of serial correlation in the data and they are robust to strong serial correlation. The data can contain a unit...