Study Search Results Your query returned 3 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: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Most Downloaded (?) Study Title/Investigator 1. Early Childhood Longitudinal Study [United States]: Kindergarten Class of 1998-1999 (ICPSR 3676) United States Department of Education. National Center for Education Statistics 1 more result in Early Childhood Longitudinal Study (ECLS) Series 2. National Household Education Survey, 1991: Revised Version (ICPSR 2762) United States Department of Education. National Center for Education Statistics 3. Project on Human Development in Chicago Neighborhoods (PHDCN): School Screen, Wave 1, 1994-1997 (ICPSR 13600) Earls, Felton J.; Brooks-Gunn, Jeanne; Raudenbush, Stephen W.; et al.