conference programme book - European Survey Research ...

90 WEDNESDAY 20 JULYon the missing gaps in data/informaon with recommendaons what could be changed, adjusted, removedor added in doing research on this topic for EU-SILC surveys for selected countries also to facilitate futureinternaonal comparisons.2.25 Internet panels for the general populaon: Fact or ficon ITo be held on July 20, 2011 from: 14:00 to 15:30, in room 412.Coordinated by:• Edith De Leeuw - University of Utrecht, Netherlands• Annee Scherpenzeel - CentERdata, Netherlands2.25.1 Surveying the General Populaon: Coverage bias in European Web SurveysE. De Leeuw 1 , A. Mohorko 2 , J. Hox 11 University of Utrecht, Netherlands; 2 Utrecht University, NetherlandsA good coverage of the intended populaon is one of the cornerstones of survey research, and the successof Internet surveys is dependent on how well the intended populaon is covered. Countries differ in Internetpenetraon, threatening the internaonal comparability of web surveys.2.25.2 Noncoverage and Nonresponse in a Probability Based Mixed-Mode Access PanelS. Bartsch 1 , U. Engel 1 , H. Vehre 11 University of Bremen, GermanyThe data quality of online access panels can be threatened by self-selecon processes into the panel (nonresponse),coverage error and mode/ response effects. Self-selecon and noncoverage is likely to lead to biasedsample esmates, while mode effects and mode-specific response effects preclude any generalizaon of outcomesproduced by one survey mode to another. To study these effects, we built up a large access panel forthe adult populaon of Germany using probability sampling for the recruitment of people by phone (landlineand cell phones). Possible access panel modes are landline, cell phone and web. The project is part of thePriority Programme 1292 on ’Survey Methodology’ (see www.survey-methodology.de).2.25.3 Capability and Movaon: Analysis of Heterogeneity in the Quality of Survey Data using an Experimentin the HRS 2009 internet Post Crash SurveyR. Willis 1 , G. Kezdi 21 University of Michigan, United States; 2 Central European University, HungaryThe quality of a survey parcipant’s answer to a given survey queson depends on both the person’s capabilityof answering the queson and his or her movaon to do so. Survey designers can influence the quality of theanswers given either by affecng the person’s ability to answer the queson (e.g., by using clear language orby reducing the difficulty of what is being asked) or by affecng the person’s movaon to answer the queson(e.g., by emphasizing the importance of the queson or providing an explicit reward for a correct answer).2.25.4 Comparing (Non-)Response Between a Sequenal Mixed Mode Design and a Probability BasedInternet PanelK. van der Houwen 1 , G. Mars 11 Stascs Netherlands (CBS), NetherlandsTradionally, there has been a strong focus within Stascs Netherlands (CBS) on collecng objecve data. Fewsurveys have incorporated quesons about people’s feelings, atudes or opinions. However, policy makers