Based on the Fragile Families and Child Wellbeing Study Year-5 wave, 1,983 children were identified as Head Start eligible children (503 Head Start enrolled children, 1,435 Head Start eligible nonparticipant) to address: (1) How do child and family characteristics differ between Head Start participants and non-participants? (2) How do Head…

Understanding and characterizing treatment effect variation in randomized experiments has become essential for going beyond the "black box" of the average treatment effect. Nonetheless, traditional statistical approaches often ignore or assume away such variation. In the context of randomized experiments, this paper proposes a framework…