Study Search Results Your query returned 2 results. Results per page: 25 50 100 Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance (?) Study Title/Investigator 1. English Longitudinal Study of Ageing (ELSA) (ICPSR 139) National Centre for Social Research (NatCen); University College London; Institute for Fiscal Studies (IFS) 2. Cross-National Equivalent File (CNEF), 1970-2009 (ICPSR 145) Cornell University. Department of Policy Analysis and Management; University of Michigan. Institute for Social Research. Panel Study of Income Dynamics; German Institute for Economic Research (DIW Berlin); et al.