NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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The Perry Preschoolers at Late Midlife: A Study in Design-Specific Inference

James J. Heckman, Ganesh Karapakula

NBER Working Paper No. 25888
Issued in May 2019

---- Acknowledgments ----

We thank Kurtis Gilliat, John Eric Humphries, Meera Mody, Sidharth Moktan, Tanya Rajan, Azeem Shaikh, Joshua Shea, Winnie van Dijk, and Jin Zhou for providing helpful comments. We also thank Jorge Luis Garcia, Sylvi Kuperman, Juan Pantano, and Anna Ziff for help on related work. We thank Alison Baulos and Lynne Pettler-Heckman for their help in designing the sample survey. We thank Mary Delcamp, Iheoma Iruka, Cheryl Polk, and Lawrence Schweinhart of the HighScope Educational Research Foundation for their assistance in data acquisition, sharing historical documentation, and their longstanding partnership with the Center for the Economics of Human Development. We thank NORC at the University of Chicago for collecting the new data used in this paper. We thank Louise Derman-Sparks and Evelyn K. Moore for discussing and sharing documentation about how the intervention was delivered. This research was supported in part by: the Buffett Early Childhood Fund; NIH Grants R01AG042390, R01AG05334301, and R37HD065072; and the American Bar Foundation. The views expressed in this paper are solely those of the authors and do not necessarily represent those of the funders or the official views of the National Institutes of Health or the National Bureau of Economic Research.

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