Study Search Results Your query returned 1 results. Series results are grouped under the most relevant study. You can ungroup series results. Use the search box below to revise your search, or start a new search. Results per page: 25 50 100 Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Most Downloaded Variable Relevance (?) Study Title/Investigator 1. National Survey of Families and Households: Wave I, 1987-1988, and Wave II, 1992-1994 (ICPSR 6906) Bumpass, Larry L.; Sweet, James A.