ii This approach allows us to avoid comparing individuals across different families whose dissimilar characteristics and experiences make it difficult to isolate the effect of Head Start. We adopt a standard, well-established method to identify the effect of Head Start, comparing children who went to Head Start with their siblings who either went to a different type of preschool or who did not attend any program. These second-generation respondents are surveyed biennially until age thirty, and are subsequently surveyed every four years. ![]() When these second-generation respondents had children, they were interviewed about the third generation. ![]() Every child of the women in the NLSY is inducted into a second generation sample almost 10,000 children have been interviewed at least once since 1986. The NLSY began as a nationally representative sample of almost 13,000 men and women in 1979. This study uses data from the National Longitudinal Survey of Youth (NLSY), a multiple-generation longitudinal survey with data on a wide range of important developmental, economic, and social topics.
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