The data is largely based on the Current Population Survey (CPS), which is a monthly survey of about 55,000 households conducted by the Bureau of Labor Statistics and the Census Bureau. That sample was generalized to about 80,000 households. In oversimplified terms, the Pew Hispanic Center subtracts the number of immigrant CPS respondents from another legal foreign-born population count to estimate the undocumented population.
“Portrait of Undocumented Immigrants in the United States” can be seen in its entirety here.
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