This user's manual describes the design, instrumentation, coding methodology, and special issues pertaining to the twin triad data file from the Early Childhood Longitudinal Study, Birth Cohort base year (9-month) data collection. Also included is information to help users access and use the...

This CD-ROM contains restricted-use base year (9-month data collection) twin triad data from the Early Childhood Longitudinal Study, Birth Cohort (ECLS-B). The twin triad data file contains data from a subsample of twins videotaped with their mothers during a teaching interaction. Triadic...