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Shapiro, 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