Policy-centred sampling in interest group research: Lessons from the INTEREURO project
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Proper sampling is the foundation for all scientific enquiry aimed at making generalizable claims about a wider set of cases. Indeed, inferential statistical analysis presupposes representative samples and units of analysis that can be considered as independent observations. Establishing a sample of issues on which lobbying may take place, which is at the same time representative of an overall population of issues and of the varying levels of conflict and political mobilization, however, is a major challenge for interest group research. Drawing on existing research practices, we discuss a series of different approaches that may be used to establish a sample of policy issues. The focus then is on the policy-centred stratified sampling procedure used in the INTEREURO project. Although our approach has important advantages, we extensively discuss several challenges we faced as well as the procedures we developed in order to deal with these.
Keywordsinterest groups INTEREURO European Union sampling survey methodology
The authors would like to express their gratitude towards various colleagues who were part of the INTEREURO team establishing this sample, more in particular Rainer Eising, Iskander De Bruycker, Daniel Rasch, Evi Roelen and Patrycja Rozbicka. We gratefully acknowledge funding from the Austrian Science Fund (FWF), project number I 576–G16 and the Research Foundation-Flanders (FWO-V), project number G.A.171.11N.
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