national system of innovation, however, implicitly assumes poolability of regional data. We apply our reasoning to Germany … further research in the field, that is, a careful evaluation of poolability and aggregation is required before estimating …

We show how to easily implement a Roy-Zellner test for poolability in STATA and we offer an application to the Grunfeld …

assumed to have common values across panel units. However, the assumption of poolability has not been studied extensively … reject and a set of series for which the poolability hypothesis fails. The method can be extended to analyse datasets with …

assumed to have common values across panel units. However, the assumption of poolability has not been studied extensively … series for which the poolability hypothesis fails. We discuss its theoretical properties and investigate its small sample …

of these homogeneity tests are necessary conditions (or maintained assumptions) for poolability of the data. Thus …