Computer-Aided Personal Interview (CAPI).

The use of a computer to assist an interviewer in carrying out an interview. Advantages include avoiding errors in skip patterns, providing immediate edit checks, and expediting electronic data capture.

Correlation bias.

A (technical) bias in dual-system estimation by which the estimated counts would be, on the average, either too low or too high, caused by heterogeneity in enumeration probabilities for both the census and the post-enumeration survey. The heterogeneities of the probabilities for these two attempted enumerations are typically positively related, which causes the estimated counts to be on the average too low.

Coverage improvement programs.

Often (but not always) nationally applied methods and programs that attempt to collect information from individuals and households that might be missed using mailout/mailback or nonresponse follow-up. Before the 2000 census cycle this term referred to such programs as the parolee and probationer program (used in 1990) in which lists of these individuals were checked to see whether they were enumerated, and the non-household sources program, in which several administrative record lists were matched to census records to try to identify people missed in the census for purposes of field follow-up. For the 2000 census, "coverage improvement" refers more to efforts to complete the address list, use of multiple response modes, and service-based enumeration.

Demographic analysis.

A method that uses various administrative records (especially birth and death records, information on immigration and emigration, and Medicare records) and information from previous censuses to estimate the total number of people in various demographic groups resident in the United States on a specific date, and therefore their census undercoverage.

Dress rehearsal.

The largest census test, typically 2 years before the decennial census, in which the methods and procedures of the upcoming decennial census are given their final test to identify any operational problems.

Dual-system estimation.

An estimation methodology that uses two independent attempts to collect information from a household to estimate the number of people missed by both attempts.

Erroneous enumeration.

The inclusion of someone in the census in error. Such inclusions may be people born after census day or deceased

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