1. Head Start Family and Child Experiences Survey (FACES): 2009 Cohort [United States];[dataset] United States Department of Health and Human Services (U.S. DHHS). Administration for Children and Families. Office of Planning, Research and Evaluation,2009
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3. 2003 Cohort [United States];[dataset] United States Department of Health and Human Services (U.S. DHHS). Administration for Children and Families. Office of Planning, Research and Evaluation. Head Start Family and Child Experiences Survey (FACES),2013
4. 2006 Cohort [United States];[dataset] United States Department of Health and Human Services (U.S. DHHS). Administration for Children and Families. Office of Planning, Research and Evaluation. Head Start Family and Child Experiences Survey (FACES),2013
5. A new look at the statistical model identification;Akaike;IEEE Transactions on Automatic Control,1974