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Direct linkShapiro, Anna; Weiland, Christina – Educational Evaluation and Policy Analysis, 2019
There are unique challenges to estimating causal effects of preschool for students with special needs that have not received attention in the literature. We revisit the Head Start Impact Study (HSIS) to illustrate that when and how special needs is defined has implications for the internal validity of and interpretation of special needs subgroup…
Descriptors: Definitions, Special Education, Preschools, Preschool Children
Bloom, Howard S.; Weiland, Christina – MDRC, 2015
This paper uses data from the Head Start Impact Study (HSIS), a nationally representative multisite randomized trial, to quantify variation in effects of Head Start during 2002-2003 on children's cognitive and socio-emotional outcomes relative to the effects of other local alternatives, including parent care. We find that (1) treatment and control…
Descriptors: Program Evaluation, Program Effectiveness, Early Intervention, At Risk Students
