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Proefschriften

13-12-2012Proefschrift Signalen voor een verhoogde kans op voortijdig schoolverlaten zijn al zichtbaar in de brugklas. Dat is één van de conclusies van het proefschrift waarmee Mw. Drs T.Traag, onderzoeker bij het Centraal Bureau voor de Statistiek, promoveerde aan de Universiteit Maastricht.

05-10-2009Proefschrift The response to a survey will never be 100%, nor will it be completely non-selective. This causes a bias in statistics based on survey research. In this PhD-thesis written by Fannie Cobben various methods for the treatment of nonresponse in sample surveys are described.

19-06-2009Proefschrift

16-04-2009Proefschrift There are still many puzzles to be solved concerning the relation between innovation and firm performance, in particular concerning the distinct roles of information and communication technology (ICT) and Research and Development (R&D) in creating new or improved products or production processes. This thesis provides evidence that both instances of innovation are important drivers of productivity and, thus, economic growth. This book consolidates the results of empirical work covering about 10 years of research aimed at understanding the importance for firm performance of innovation in a broad sense.

23-01-2009Proefschrift The subject of this thesis is difficult groups in survey research. Moeilijk waarneembare groepen in enquêteonderzoek is het onderwerp van deze dissertatie

16-07-2008Proefschrift The Ph.D. thesis by Ton de Waal examines two different areas: detection of erroneous data and protection of sensitive data.By assuming that as few errors as possible have been made while answering and processing the questionnaires, the detection of erroneous data can be formulated as a mathematical optimisation problem. In the thesis a number of methods are developed to solve this optimisation problem efficiently. Sensitive data of individual respondents or small groups of respondents have to be protected, for instance by not publishing these data. In the thesis several mathematical problems with respect to protecting sensitive data are explored. For a number of problems, such as calculating the information loss due to protecting sensitive data and minimising the information that is not published, solutions are presented.

20-02-2007Proefschrift

07-05-2004Proefschrift

25-03-2003Proefschrift