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. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Dynamics of Economic and Demographic Behavior: "Clean Processes" From the Panel Study of Income Dynamics (PSID) (ICPSR 1239) Lillard, Lee A. 2. Panel Study of Income Dynamics, 1968-1999: Annual Core Data (ICPSR 7439) Hofferth, Sandra; Stafford, Frank P.; Yeung, Wei-Jun J.; et al.