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A nationwide unduplication operation is being considered for the 2010 Census. One potential problem is the possibility of finding large numbers of false positives, especially when matching above the county level. To help evaluate the extent of this problem, the Census Bureau's Big Match program performed a matching of person records across all Census addresses, using data from the 2000 Census.
This report provides an overview of the matching methodology and of the results of an exploratory analysis of the matching output. As expected, most of the problem with apparent false matches seems to be concentrated in the most common surnames and the most common Hispanic surnames, especially for matches outside the state. In contrast, for given names there does not appear to be a strong effect of name frequency on false matches.
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