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SERIAL40
Household serial number, before large group quarters were split up, 1940 100%

Description

SERIAL40 provides the original household serial number in the 1940 100% dataset.

As a part of IPUMS data processing, group quarters units containing more than 60 people were split into 1-person households, each with their own unique value in the IPUMS SERIAL variable. For this reason, the SERIAL variable makes it impossible to identify any group of people who share a group quarters unit containing more than 60 people.

Researchers needing to analyze intact group quarters units containing more than 60 people (such as the residents of a large prison or poorhouse) should use SERIAL40 instead of SERIAL. SERIAL40 assigns a common serial number to all residents of each housing unit and group quarters, regardless of size. Original serial numbers in the 1940 100% file were generated at the State level. Researchers will need to use STATEFIP/STATEICP and SERIAL40 to uniquely identify original split group quarters.

Units that were split into 1-person households can be identified with the SPLIT40variable.

Codes

This variable is only available in the 1940 100% dataset. SERIAL40 is an 8-digit numeric variable giving the original household serial from the 1940 100% data file, before larger, non-family, households were broken into single-person households. As a part of IPUMS data processing, group quarters units containing more than 60 people were split into 1-person households, each with their own unique value in the IPUMS SERIAL variable. For this reason, the SERIAL variable makes it impossible to identify any group of people who share a group quarters unit containing more than 60 people. Researchers needing to analyze intact group quarters units containing more than 60 people (such as the residents of a large prison or poorhouse) should use SERIAL40 instead of SERIAL. SERIAL40 assigns a common serial number to all residents of each housing unit and group quarters, regardless of size. SERIAL40 specific variable codes for missing, edited, or unidentified observations, observations not applicable (N/A), observations not in universe (NIU), top and bottom value coding, etc. are provided below by Census year (and data sample if specified).

User Note: Original serial numbers in the 1940 100% file were generated at the State level. Researchers will need to use STATEFIP/STATEICP and SERIAL40 to uniquely identify original split group quarters. Units that were split into 1-person households can be identified with the SPLIT40variable.

SERIAL40 Specific Variable Codes

Comparability

This variable is only available in the 1940 100% dataset.

Universe

  • All households and group quarters.

Availability

United States
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  • 1940: 100%
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Puerto Rico
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Flags

This variable has no flags.

Editing Procedure

There is no editing procedure available for this variable.