International surveys of learning achievement and functional literacy are increasingly common. We consider two aspects of the robustness of their results. First, we compare results from four surveys: TIMSS, PISA, PIRLS and IALS. This contrasts with the standard approach which is to analyse a...

Entwicklung und Grundlagen des internationalen Direktmarketing Nationales versus internationales Direktmarketing Prozesse und Rahmenbedingungen des internationalen Direktmarketing Internationale Direktmarketingstrategien von Unternehmen Erfolgsfaktoren des internationalen Direktmarketing Neue...

We examine whether the sorting of differently achieving students into differently sized classes results in a regressive or compensatory pattern of class sizes for a sample of national school systems. Sorting effects are identified by subtracting the causal effect of class size on performance...