TY - RPRT A1 - Andreassen, C. A1 - Fletcher, P. T1 - Early Childhood Longitudinal Study, Birth Cohort (ECLS–B) psychometric report for the 2-year data collection (NCES 2007–084) Y1 - 2007 PB - National Center for Education Statistics, Institute of Education Sciences, U.S. Department of Education CY - Washington, D.C. T3 - 84 ER -