Under “Downloads,” to your right, you will find the data used to create the interactive graphics accompanying the report, “The benefits and costs of investing in early childhood education.” All data is available at the state level.
Please cite the Washington Center for Equitable Growth if you use the data. (Full suggested citation: Robert G. Lynch and Kavya Vaghul. 2015. “The benefits and costs of investing in early childhood education: the fiscal, economic, and societal gains of a universal prekindergarten program in the United States, 2016-2050” Washington, DC: Washington Center for Equitable Growth.)
For the full methodology, please see page 57 of the report PDF.