ERDC's P20W Longitudinal Data System Research Handbook introduces researchers and analysts to the Washington Preschool-to-Grade 20-to-Workforce (P20W) data warehouse and the use of its products for research and analysis purposes. The research handbook summarizes the core source data that goes into the P20W data warehouse. It also contains information about ERDC's data request process and common methodologies used in P20W research.
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