for their diverse perspectives and technical expertise, in accordance with procedures approved by the Report Review Committee of the NRC. The purpose of this independent review is to provide candid and critical comments that assist the institution in making its reports as sound as possible and to ensure that the reports meet institutional standards for objectivity, evidence, and responsiveness to the study charge. The review comments and draft manuscript remain confidential to protect the integrity of the deliberative process.

The panel thanks the following individuals for their review of the report: Frank D. Bean, Center for Research on Immigration, Population and Public Policy, University of California, Irvine; Víctor Alfredo Bustos y de la Tijera, Office of the Deputy Director General, National Institute of Statistics and Geography, Aguascalientes City, Mexico; Rebecca L. Clark, Demographic and Behavioral Sciences Branch, National Institute of Child Health and Human Development; Krista J. Gile, Department of Mathematics and Statistics, University of Massachusetts; Joel L. Horowitz, Department of Economics, Northwestern University; Roderick J. Little, Department of Biostatistics, School of Public Health, University of Michigan; Douglas S. Massey, Department of Sociology, Princeton University; Hal S. Stern, Donald Bren School of Information and Computer Sciences, University of California, Irvine; and Victoria Velkoff, Assistant Division Chief, Population Estimates and Projections, Population Division, U.S. Census Bureau.

Although the reviewers listed above have provided many constructive comments and suggestions, they were not asked to endorse the conclusions or recommendations, nor did they see the final draft of the report before its release. The review of the report was overseen by John Rolph, University of Southern California, and Charles Manski, Northwestern University. Appointed by the NRC, they were responsible for making certain that the independent examination of this report was carried out in accordance with institutional procedures and that all review comments were carefully considered. Responsibility for the final content of the report rests entirely with the authoring committee and the National Research Council.

Alicia Carriquiry, Chair
Panel on Survey Options for Estimating the Flow of Unauthorized Crossings at the U.S.–Mexican Border



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