“This report focuses on the unauthorized immigrant population in the United States. The Pew Hispanic Center estimates the unauthorized immigrant population using the residual method, a well-developed and widely accepted technique that is based on official government data. For more details, see Unauthorized Immigrant Population: National and State Trends, 2010 by Jeffrey Passel and DVera Cohn (2011). In this report, data come mainly from the March 2010 Current Population Survey (CPS), conducted jointly by the U.S. Bureau of Labor Statistics and the Census Bureau. It is best known as the source for monthly unemployment statistics. Each March, the CPS sample size and questionnaire are expanded to produce additional data on the foreign-born population and other topics. The Pew Hispanic Center estimates make adjustments to the government data to compensate for undercounting of some groups, and therefore its population totals differ somewhat from the ones the government uses. The report also uses the Pew Hispanic Centers 2010 National Survey of Latinos (NSL). The survey was conducted August 17 through September 19, 2010, among a randomly selected, nationally representative sample of 1,375 Latino adults. The survey was conducted in both English and Spanish on cellular as well as landline telephones. For more details on the 2010 NSL methodology, see Latinos and the 2010 Elections: Strong Support for Democrats; Weak Voter Motivation by Mark Hugo Lopez (2010).”
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