Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Series results are grouped under the most relevant study. Ungroup series results to view all 2 results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. European and World Values Surveys Four-wave Integrated Data File, 1981-2004 (ICPSR 4531) European Values Study Group; World Values Survey Association 2. Global Digital Activism Data Set, 2013 (ICPSR 34625) Joyce, Mary; Rosas, António; Howard, Philip N.