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SSRC Library

The SSRC Library allows visitors to access materials related to self-sufficiency programs, practice and research. Visitors can view common search terms, conduct a keyword search or create a custom search using any combination of the filters at the left side of this page. To conduct a keyword search, type a term or combination of terms into the search box below, select whether you want to search the exact phrase or the words in any order, and click on the blue button to the right of the search box to view relevant results.

Writing a paper? Working on a literature review? Citing research in a funding proposal? Use the SSRC Citation Assistance Tool to compile citations.

  • Conduct a search and filter parameters as desired.
  • "Check" the box next to the resources for which you would like a citation.
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The SSRC Library includes resources which may be available only via journal subscription. The SSRC may be able to provide users without subscription access to a particular journal with a single use copy of the full text.  Please email the SSRC with your request.

The SSRC Library collection is constantly growing and new research is added regularly. We welcome our users to submit a library item to help us grow our collection in response to your needs.


  • Individual Author: Duncan, Greg J.; National Institute of Child Health and Human Development Early Child Care Research Network
    Reference Type: Journal Article
    Year: 2003

    The National Institute of Child Health and Human Development (NICHD) Study of Early Child Care compared 3 statistical methods that adjust for family selection bias to test whether child care type and quality relate to cognitive and academic skills. The methods included: multiple regression models of 54-month outcomes, change models of differences in 24- and 54-month outcomes, and residualized change models of 54-month outcomes adjusting for the 24-month outcome. The study was unable to establish empirically which model best adjusted for selection and omitted-variable bias. Nevertheless, results suggested that child care quality predicted cognitive outcomes at 54 months, with effect sizes of .04 to .08 for both infant and preschool ages. Center care during preschool years also predicted outcomes across all models. (Author abstract)

    The National Institute of Child Health and Human Development (NICHD) Study of Early Child Care compared 3 statistical methods that adjust for family selection bias to test whether child care type and quality relate to cognitive and academic skills. The methods included: multiple regression models of 54-month outcomes, change models of differences in 24- and 54-month outcomes, and residualized change models of 54-month outcomes adjusting for the 24-month outcome. The study was unable to establish empirically which model best adjusted for selection and omitted-variable bias. Nevertheless, results suggested that child care quality predicted cognitive outcomes at 54 months, with effect sizes of .04 to .08 for both infant and preschool ages. Center care during preschool years also predicted outcomes across all models. (Author abstract)