Early Childhood Longitudinal Study, Kindergarten Class of 1998-99
The Early Childhood Longitudinal Study, Kindergarten Class of 1998-99 (ECLS-K), is part of the Early Childhood Longitudinal Study (ECLS) program; program data is available since 1998-99 at <https://nces.ed.gov/ecls/dataproducts.asp>. ECLS-K (https://nces.ed.gov/ecls/kindergarten.asp) is a longitudinal study that …