Käufer von Sammelbildern mögen sich bisweilen fragen, wieviele Käufe sie noch tätigen müssen, um bestimmte Bilder, die zu Gruppen in Tüten verpackt sind, zu erhalten. Dies ist eine gegenüber dem typischen "Coupon Collectors Problem" modifizierte Fragestellung, da es dort vornehmlich um...

We analyse the impact of multinationality on shareholder value in the case of German firms for the time span from 1990 to 2006. Based on a sample of 13,130 firm-year observations, we find that multinational companies perform worse in terms of shareholder value than domestic companies. This...

"In this paper, stochastic production frontier models are estimated with IAB establishment data from waves 2002 and 2003 to analyze productivity and inefficiency. The data suffer from nonresponse in the most important variables (output, capital and labor) leading to the loss of 25 % of the...

"This paper illustrates the effects of item-nonresponse in surveys on the results of multivariate statistical analysis when estimation of productivity is the task. To multiply impute the missing data a data augmentation algorithm based on a normal/Wishart model is applied. Data of the German IAB...

"This paper presents the project 'Treatment Effects and Prediction' (TrEffeR) of the Federal Employment Agency (Bundesagentur für Arbeit - BA). One of the tasks of the project is to provide estimates of the effectiveness of active labor market policy measures for management purposes. The...

"For micro-datasets considered for release as scientific or public use files, statistical agencies have to face the dilemma of guaranteeing the confidentiality of survey respondents on the one hand and offering sufficiently detailed data on the other hand. For that reason a variety of methods to...

"In der Bundesagentur für Arbeit (BA) wird derzeit ein System der quantitativen Wirkungsanalyse arbeitsmarktpolitischer Maßnahmen entwickelt, das in Zukunft die operative Steuerung unterstützen soll. Wichtiger Bestandteil ist die neu aufgebaute Datenbank des Projektes 'Treatment Effects and...