Description

For persons in full count census files other than 1940, LINK1940 indicates if that person is linked to the 1940 census. Linked persons receive a common Historical Identification Key (HIK) value across all censuses in which they are identified. See the HIK variable for more information.

For persons in the 1940 census, a LINK1940 value of 1 indicates that they are linked to another census year, and in some cases multiple census years.

The LINK variables (one for each historical census) are useful for limiting the dataset to the linked population, reducing its size. For this reason, the LINK variables are automatically included in an extract request if a user indicates that they want to link census data on the sample selection page. By default, the resulting dataset will be limited to only cases that have a LINK value of 1. Users can modify this behavior by clicking on "Select Cases" on the Extract Request page before they submit their request.

Codes

This variable is not available for any of the currently selected samples.

Comparability

This variable is comparable across all available datasets.

Universe

Availability

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• 1990: --
• 1980: --
• 1970: --
• 1960: --
• 1950: --
• 1940: 100%
• 1930: 100%
• 1920: 100%
• 1910: 100%
• 1900: 100%
• 1880: 100%
• 1870: 100%
• 1860: 100%
• 1850: 100%

• 2023: --
• 2022: --
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• 2005: --
• 2000: --
• 1990: --
• 1980: --
• 1970: --
• 1930: --
• 1920: --
• 1910: --

Flags

Editing Procedure

There is no editing procedure available for this variable.