Political science data often contain grouped observations, which produces unobserved "cluster effects" in statistical models. Typical solutions include (1) ignoring the impact on coefficients and only adjusting the standard errors of generalized linear models (GLM) or (2) addressing clustering...

Abstract This article presents original mixed method research to describe the use of rare illicit psychoactive substances, with special emphasis on crack cocaine in France. We first introduce a unique monitoring system committed to the observation of hard-to-reach populations. Qualitative...

The objective of this paper is primarily methodological. Using a new specification, we reanalyze the data on worldwide environmental quality investigated by Gene Grossman and Alan Krueger in their well-known paper on the environmental Kuznets curve (which postulates an inverse U-shaped...

This paper shows how to take into account risk aversion when measuring poverty under income variability. An application to British panel data suggests that income and poverty comparisons between the self-employed and other groups of households are sensitive to assumptions on the degree of risk...

In December 1993, restrictions to foreign ownership across major Mexican economic sectors were abolished. This paper studies output, industrialization intensity, ``international infrastructure", and government expenditures on infrastructure as determinants of FDI inflows into Mexican states over...

In recent years, there has been a lack of empirical work devoted to the explanation of migration patterns into the European Union with the exception of country specific studies. At the same time, migration theories have undergone a considerable renewal, which has led to the development of new...

Zusammenfassung Die Analyse von Paneldaten für Deutschland und Portugal und die Schätzung von Matching- Funktionen für Berufsgruppen zeigt in Deutschland eine fallende und in Portugal eine steigende Effizienz des Matching-Prozesses. Löhne in Deutschland und Mindestlöhne in Portugal sind...

Summary This paper reviews various mobility measures and establishes their asymptotic sampling distribution. The focus is on both transition matrix mobility measures and mobility measures which are based on the reduction in inequality occurring when the accounting period is extended. Statistical...

Summary The changes in the financial structures of West German industrial enterprises have been investigated in Größl/Stahlecker/Wohlers (2001). The empirical analysis confirmed the hypothesis that small and medium-sized enterprises are confronted with higher - and even rising - financial...

Summary This paper investigates the borrowing behavior of 2,900 French and 1,300 German firms over the 1987-95 period. Both samples based on data sets of the Banque de France and the Deutsche Bundesbank not only include large but also small and medium-sized enterprises. Applying GMM techniques,...