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Description

HIK is a universal identifier key used to track individuals across historical censuses.

HIKs are the product of a complex linking process developed by the Multigenerational Longitudinal Panel (MLP) project. The MLP project and a description of the linking process are described at the Multigenerational Longitudinal Panel home page.

Currently, persons are only linked between adjacent census years or strings of adjacent census years. The linking algorithm does not seek links across non-adjacent decennial census years. For example: an individual can be linked from 1860 to 1870, and then from 1870 to 1880. However, if no link can be made between 1860 and 1870, that person would also not be linkable to 1880 even though they might exist in the data.

We expect to improve the linking algorithm in the coming years applying new data and techniques. If the relationship between any of the person identifiers (HISTIDs) and a HIK change, the old HIK will be permanently discarded and a new HIK will be generated. Old (obsolete) HIKs will be archived and made available for download.

Codes

HIK is a 21-character, consistent individual-level identifier. Only persons who can be linked are assigned a HIK; this variable is blank for those who cannot be linked.

Comparability

This variable is comparable across all available datasets.

Universe

  • All persons linkable to an adjacent census year.

Availability

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

Flags

This variable has no flags.

Editing Procedure

There is no editing procedure available for this variable.