relied on information provided by the respondent about how many days in the previous seven that services had been used. The methodology for the multiplicity estimator is similar to that of the Politz-Simmons estimator (Politz and Simmons, 1949, 1950).

Both the dual-system estimator and the multiplicity estimator rely on several assumptions that are questionable in this application. These coverage measurement methods were examined further in the 1996 test, but results from it were not available for this report.

Recommendation: The Census Bureau should continue research to determine the best means to enumerate people with no usual residence. This effort should be part of the Census Bureau's research agenda, with specific goals for both pre-2000 research and to learn from 2000 for the 2010 census.

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