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with Westat to conduct the Head Start Impact Study. The views expressed in this report are those of the authors and they do not necessarily represent the opinions and positions of the Acknowledgements This report of the Head Start Impact Study is the result of several years of design, data collection, and analysis. We gratefully acknowledge the(More)
Disclaimer: This report is released to inform interested parties of research and to encourage discussion. The views expressed are those of the authors and not necessarily those of the U.S. Census Bureau. Abstract A large differential undercount biases census and survey data collected by the Census Bureau. This paper reviews evidence on magnitude and causes(More)
This paper offers a first statistical look at the Guatemalan National Police Archive (GPNA). Preliminary estimates are provided of the degree to which specific groups within the National Police were aware of violent acts reported in the institution's documents. Weighted estimates were calculated based on a multi-stage sample of documents from the GNPA. As(More)