Balancing error.

Type of error cited by the Executive Steering Committee for A.C.E. Policy in its recommendation not to adjust census counts for congressional redistricting. Balancing error occurs when cases in the P-sample and E-sample are not treated identically (e.g., when the search area used to identify P-sample matches and E-sample correct enumerations is defined differently).

“Be Counted.”

A program introduced in the 2000 census that made census questionnaires available in public places, so that residents who believed that they had been missed in the regular census enumeration could file a questionnaire.

Blue line.

Descriptive term used to differentiate basic types of addresses. Areas of residences with mainly city-style addresses (number and street) are said to be inside the blue line, and areas of residences with mainly non-city-style addresses (such as rural route and post office boxes) are said to be outside the blue line. The term derives from the color used on initial sets of maps generated prior to the Local Update of Census Addresses (LUCA) Program; the 1998 implementation of LUCA targeted addresses inside the blue line and the 1999 implementation targeted those outside. Mailout/mailback enumeration was used inside the blue line and update/leave enumeration was used outside the blue line.

Block cluster.

Group of one or more census blocks expected to contain about 30 housing units, defined for use in the Accuracy and Coverage Evaluation Program.

Casing check.

A program in which postal workers determine addresses for which they did not receive a questionnaire and notify the Census Bureau.

Census block.

The smallest entity for which the Census Bureau collects and tabulates decennial census information; bounded on all sides by visible and nonvisible features shown on Census Bureau maps. Occasionally, especially in rural areas, drainage ditches or power lines may be used to define blocks. Because most blocks have small population and housing unit counts, only 100 percent data, or short-form data, are tabulated for them.

Census Day.

The target date of a decennial census. Census Day is the date for which census respondents are supposed to describe their household population, and for which the results of a decennial census are supposed to be an accurate representation of the nation’s population. Since 1930, Census Day has been April 1 of years ending in zero.

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