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110 WEDNESDAY 20 JULY2.43.4 Comparing Administrave Data to the 2010 U.S. CensusL. Marshall 11 U.S. Census Bureau, United StatesThe U.S. Census Bureau has acquired and evaluated administrave records data since 1999. Previous studieshave compared administrave records data to the U.S. Census – reviewing populaon counts and distribuonsof demographic characteriscs. This paper discusses plans for the U.S. Census Bureau’s ”2010 Census MatchStudy” which intends to fully analyze the coverage of administrave records data compared to the 2010 U.S.Census. Topics to be discussed include acquision plans for new administrave records data, development ofimproved record linkage procedures, and plans to use the match results to compare the individuals and theaddresses in each database. While populaon counts, housing counts, and even demographic distribuonsmay be similar between administrave records data and the 2010 U.S. Census, the specific individuals andaddresses may differ. This paper discusses plans to evaluate those differences...2.44 Internet panels for the general populaon: Fact or ficon IITo be held on July 20, 2011 from: 16:00 to 17:30, in room 412.Coordinated by:• Edith De Leeuw - University of Utrecht, Netherlands• Annee Scherpenzeel - CentERdata, Netherlands2.44.1 Why do Internet panel members become inacve and how can they be re-acvated?A. Scherpenzeel 11 CentERdata, NetherlandsThe LISS panel (Longitudinal Internet Studies for the Social sciences) is an online panel which is based on a trueprobability sample of households. Households that cannot otherwise parcipate are provided with a computerand Internet connecon.2.44.2 Can Tailor-made Quesons Movate Respondents in an Internet Panel?M. Oudejans 11 CentERdata, NetherlandsAlmost no literature exists on the effects of the topic of the quesonnaires on panel parcipaon. In this paperI will explore how the addion of ”tailor-made quesons” at the end of exisng quesonnaires will affect theevaluaon of the quesonnaire. The experiment will be embedded in the Dutch CentERdata LISS panel; a panelof 5.000 households that complete surveys every month.2.44.3 Answer behavior in a probability based internet panelC. Vis 2 , A. Wijnant 11 CentERdata Tilburg University , Netherlands; 2 CentERdata, NetherlandsIn 2007 CentERdata (Tilburg University, the Netherlands) started the MESS project by seng up the LISS panel.The LISS panel is a probability based internet panel representave of the Dutch populaon, consisng of 5,000households. On a monthly basis, the panel members fill out quesonnaires for about 30 minutes.2.44.4 Design and Implementaon of an Online Weekly Survey to Study Unintended Pregnancies: PreliminaryResultsJ. Barber 1 , Y. Kusunoki 2 , H. Gatny 2