Stichprobenverzerrung durch Item-Nonresponse in der international vergleichenden Politikwissenschaft

Volker Stocké () and Tobias Stark ()
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Volker Stocké: Sonderforschungsbereich 504, Postal: L 13, 15, D-68131 Mannheim
Tobias Stark: Sonderforschungsbereich 504, Postal: L 13, 15, D-68131 Mannheim

No 05-43, Sonderforschungsbereich 504 Publications from Sonderforschungsbereich 504, Universität Mannheim, Sonderforschungsbereich 504, University of Mannheim

Abstract: The respondents’ susceptibility to item nonresponse is an important determinant for the quality of political science survey data. In particular, one has to expect biased samples when groups of respondents systematically differ in their nonresponse rates. Our study tests firstly whether and how strong four different aspects of political involvement which are frequently used in political studies affect the respondents’ susceptibility to nonresponse. Secondly, we tested the con-sequences of these differences in item nonresponse for the presence of sample-selection bias in general, and in particular for the comparability of the samples in international comparative political science research. The database of our study are Eurobarometer studies in the 10 new member states of the European Union. According to our first result, politically involved respondents are substantially less likely to refuse to answer questions and in particular less prone to “don’t know” responses. Our second result indicates that this causes a systematic over representation of involved respondents. The strength of this sample selection bias differs substantially between the analyzed countries.

Pages: 28 pages
Date: 2005-12-12
Note: We would like to thank Hartmut Esser for helpful comments and suggestions. Financial support from the Deutsche Forschungsgemeinschaft, SFB 504, at the University of Mannheim, is gratefully acknowledged.
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