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BIRTHYR
Year of birth

Description

BIRTHYR reports the person's year of birth. Researchers should use this variable with caution; see the comparability section for details.

Codes

BIRTHYR is a 4-digit numeric code reporting the respondent's year of birth. BIRTHYR 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: Researchers should use this variable with caution (See Comparability)

BIRTHYR Specific Variable Codes
9996 = not classified
9997 = illegible
9998 = unknown
9999 = missing/blank

Comparability

Self-reported birth year is available only for the 1 percent samples for 1900 and 1910, as well as the 1900 100% database - in which it occasionally conflicts with self-reported AGE. IPUMS retains this original detail; users should exercise caution in these situations.

In all other samples, self-reported birth year is not available but has been calculated by subtracting AGE from the survey year (MULTYEAR in the multi-year ACS/PRCS samples; YEAR in all other samples). This is a crude calculation; it is one year late for all individuals who have a birthday after the date of survey, as seen in the following table:

table_244.html
Month of birth Actual year of birth Age on 2000 Census Day (April 1) Calculated year of birth (2000 - age)
January
1990
10
1990
December
1990
9
1991

Birth quarter (BIRTHQTR) can be used to refine the calculation of BIRTHYR for all respondents in the 1960-1980 samples, and for people under age 1 in 1870, 1880 (excluding the 100% database), and 1950 samples. In all other samples, where no additional information on the date of birth is available, it will be off by one year for everyone who has a birthday after the survey date. BIRTHQTR is also available in the 2005-onward ACS/PRCS; however, since the date of survey is not fixed as it is for the decennial censuses, the true year of birth cannot be determined. Because ACS/PRCS respondents are surveyed throughout the year, though, the errors averaged across the entire sample will be close to zero.

Universe

  • 1850-1900: All persons.
  • 1910 samples: All persons in Alaska.
  • 1910 100%: All persons.
  • 1920-2016 2016 2016 2016: All persons.

Availability

United States
  • 2016: All samples
  • 2015: All samples
  • 2014: All samples
  • 2013: All samples
  • 2012: All samples
  • 2011: All samples
  • 2010: ACS; ACS 3yr; ACS 5yr
  • 2009: All samples
  • 2008: All samples
  • 2007: All samples
  • 2006: All samples
  • 2005: All samples
  • 2004: All samples
  • 2003: All samples
  • 2002: All samples
  • 2001: All samples
  • 2000: All samples
  • 1990: All samples
  • 1980: All samples
  • 1970: All samples
  • 1960: All samples
  • 1950: All samples
  • 1940: 1%
  • 1930: All samples
  • 1920: All samples
  • 1910: All samples
  • 1900: All samples
  • 1880: All samples
  • 1870: All samples
  • 1860: All samples
  • 1850: All samples
Puerto Rico
  • 2016: All samples
  • 2015: All samples
  • 2014: All samples
  • 2013: All samples
  • 2012: All samples
  • 2011: All samples
  • 2010: PRCS; PRCS 3yr; PRCS 5yr
  • 2009: All samples
  • 2008: All samples
  • 2007: All samples
  • 2006: All samples
  • 2005: All samples
  • 2000: All samples
  • 1990: All samples
  • 1980: All samples
  • 1970: All samples
  • 1930: All samples
  • 1920: All samples
  • 1910: --

Flags

This variable has no flags.

Editing Procedure

There is no editing procedure available for this variable.