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BIRTHYR
Year of birth

Codes and Frequencies



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Description

BIRTHYR gives the person's year of birth.

Comparability — Index

GENERAL
Armenia
Burkina Faso
Cameroon
Egypt
Fiji
France
Germany
Guinea
Indonesia
Iran
Jamaica
Mali
Morocco
Nicaragua
Nigeria
South Africa
Spain
Thailand
Ukraine
Uruguay
Vietnam

Comparability — General

There are no comparability issues across samples, apart from differing bottom-codes (see the codes page), the universe difference for South Africa 2007, and the use of the Hijiri calendar instead of the Gregorian one in the Iran and Morocco samples.

Some samples have large numbers of non-responses.

The variable may suffer from respondent rounding (or "digit preference") in some samples as seen with AGE, especially when birth year is based off of or asked in tandem with age. Therefore, birth years in five or ten year segments previous to the census year (e.g. 1958 for a 2008 sample) may be over-represented.

Comparability — Armenia [top]

The 2011 sample begins recording information from the year 1915 or earlier. The question was asked to all persons

Comparability — Burkina Faso [top]

In 1996 sample, large numbers of respondents are coded to "unknown" because they provided their age in years rather than the full date of birth. In 2006, the respondents provided their date of birth, if known.

Comparability — Cameroon [top]

In 1976, large numbers of respondents are coded to "unknown" because they provided their age at last birthday rather than the full date of birth. The 1987 sample only provides the age of the respondents.

Comparability — Egypt [top]

Large numbers of respondents are coded to "unknown" because they provided their age rather than date of birth.

Comparability — Fiji [top]

In the 1966, 1976 and 1986 samples, the year of birth was estimated by the statistical office, if date of birth was unknown.

Comparability — France [top]

The 2006 sample from France combines data for the 2004-2008 years. Therefore, this sample includes births up to 2008.

The unharmonized variables in the 1962, 1968, 1975, 1982, and 1990 samples collect the respondent's age in calendar year.
In 2011 census begins recording information from year 1900 or earlier.

Comparability — Germany [top]

This variable is not available for the 1971 and 1981 samples. The variable is comparable in the remaining two samples.

Comparability — Guinea [top]

Over 70 percent of cases have no response.

Comparability — Indonesia [top]

In the 1976 sample, approximately 31 percent of respondents did not report a birth year. However, these same respondents reported information on their age. It is possible that the enumerator recorded the age of the respondent but not his/her year of birth. These cases are located in the "Unknown" category of BIRTHYR.
Roughly half of respondents have no response in the 1980 sample.

Comparability — Iran [top]

In both 2006 and 2011, year of birth was reported according to the Hijiri (i.e., Persian) calendar. The Hijiri year was matched with the Gregorian year in which it began. For example, the year 1286 of the Hijiri calendar corresponds to a 12-month period that falls between 1907 and 1908 of the Gregorian calendar. Therefore, 1286 corresponds to 1907 in the harmonized variable.

See the unharmonized source variables to recover the information in both the Hijiri and Gregorian calendars.

Comparability — Jamaica [top]

This variable is not available for the 1982 sample. The 1991 sample has an unknown category, while the 2001 sample does not.

Comparability — Mali [top]

The 2009 sample begins recording information from the year 1909.

Comparability — Morocco [top]

In the 1994 sample, responses based on the Hegira calendar are converted to the Gregorian calendar. Approximately 62% of respondents in this sample have no response.

Comparability — Nicaragua [top]

The 1995 and 2005 samples are comparable.

Comparability — Nigeria [top]

The 2010 sample reports some case with 2011 as the birth year; the 2010 survey was implemented between 2010 and 2011.

Comparability — South Africa [top]

In 2007 the census question was not asked of persons in institutions.
In 2011 the census question was asked to all persons. The census begins recording information from year 1900 or earlier.

Comparability — Spain [top]

The 2011 sample begins recording information from the year 1905.

Comparability — Thailand [top]

In the 2000 sample, the year was recorded according to the Thai Buddhist calendar and translated into the Western calendar.

A considerable proportion of respondents in all three samples reported their year of birth using the Thai Zodiacal calendar (12 animals). Because of the cyclical nature of this system and the imperfect correspondence between the Buddhist and the Western New Year date, IPUMS does not infer the year of birth in these cases. They are coded to the "unknown" category. See the unharmonized source variables to recover this information.

Comparability — Ukraine [top]

The 2001 sample begins recording information from the year 1910.

Comparability — Uruguay [top]

The 2011 sample begins recording information from the year 1911.

Comparability — Vietnam [top]

The 1989 and 2009 samples have an unknown category, while the 1999 sample does not.

Universe

  • Argentina 2010: All persons
  • Armenia 2001: All persons
  • Armenia 2011: All persons
  • Austria 1971: All persons
  • Austria 1981: All persons
  • Austria 1991: All persons
  • Austria 2001: All persons
  • Benin 1992: All persons
  • Benin 2002: All persons
  • Benin 2013: All persons
  • Burkina Faso 1996: All persons
  • Burkina Faso 2006: All persons
  • Cameroon 1976: All persons
  • Cameroon 2005: All persons
  • Canada 1981: All persons
  • China 1990: All persons
  • China 2000: All persons
  • Colombia 2005: All persons
  • Dominican Republic 2002: All persons
  • Dominican Republic 2010: All persons
  • Ecuador 2010: All persons
  • Egypt 1986: All persons
  • Egypt 1996: All persons
  • El Salvador 1992: All persons
  • El Salvador 2007: All persons
  • Fiji 1966: All persons
  • Fiji 1976: All persons
  • Fiji 1986: All persons
  • Fiji 1996: All persons
  • Fiji 2007: All persons
  • France 1962: All persons
  • France 1968: All persons
  • France 1975: All persons
  • France 1982: All persons
  • France 1990: All persons
  • France 2006: All persons
  • France 2011: All persons
  • Germany 1970: All persons
  • Germany 1987: All persons
  • Greece 1971: All persons
  • Greece 1981: All persons
  • Greece 1991: All persons
  • Greece 2001: All persons
  • Greece 2011: All persons
  • Guinea 1996: All persons
  • Honduras 1988: All persons
  • Indonesia 1976: All persons
  • Indonesia 1980: All persons
  • Indonesia 1990: All persons
  • Indonesia 1995: All persons
  • Indonesia 2000: All persons
  • Indonesia 2005: All persons
  • Indonesia 2010: All persons
  • Iran 2006: All persons
  • Iran 2011: All persons
  • Iraq 1997: All persons
  • Jamaica 1991: All persons
  • Jamaica 2001: All persons
  • Jordan 2004: All persons
  • Kyrgyz Republic 1999: All persons
  • Kyrgyz Republic 2009: All persons
  • Lesotho 2006: All persons
  • Malawi 2008: All persons
  • Malaysia 1980: All persons
  • Malaysia 1991: All persons
  • Mali 1998: All persons
  • Mali 2009: All persons
  • Mongolia 1989: All persons
  • Mongolia 2000: All persons
  • Morocco 1994: All persons
  • Morocco 2004: All persons
  • Nicaragua 1995: All persons
  • Nicaragua 2005: All persons
  • Nigeria 2010: All persons
  • Papua New Guinea 1980: All persons
  • Papua New Guinea 1990: All persons
  • Papua New Guinea 2000: All persons
  • Poland 1978: All persons
  • Poland 1988: All persons
  • Poland 2002: All persons
  • Romania 1977: All persons
  • Romania 1992: All persons
  • Romania 2002: All persons
  • Romania 2011: All persons
  • Rwanda 1991: All persons
  • Rwanda 2002: All persons
  • Rwanda 2012: All persons
  • Senegal 2002: All persons
  • South Africa 2007: Persons not residing in institutions
  • South Africa 2011: All persons
  • Spain 1981: All persons
  • Spain 1991: All persons
  • Spain 2001: All persons
  • Spain 2011: All persons
  • Thailand 1980: All persons
  • Thailand 1990: All persons
  • Thailand 2000: All persons
  • Trinidad and Tobago 2011: Persons in private households or institutions
  • Uganda 2002: All persons
  • Ukraine 2001: All persons
  • United States 2000: All persons
  • United States 2010: All persons
  • United States 2015: All persons
  • Uruguay 2011: All persons
  • Vietnam 1989: All persons
  • Vietnam 1999: All persons
  • Vietnam 2009: All persons

Availability

  • Argentina: 2010
  • Armenia: 2001, 2011
  • Austria: 1971, 1981, 1991, 2001
  • Benin: 1992, 2002, 2013
  • Burkina Faso: 1996, 2006
  • Cameroon: 1976, 2005
  • Canada: 1901, 1911, 1981
  • China: 1990, 2000
  • Colombia: 2005
  • Dominican Republic: 2002, 2010
  • Ecuador: 2010
  • Egypt: 1986, 1996
  • El Salvador: 1992, 2007
  • Fiji: 1966, 1976, 1986, 1996, 2007
  • France: 1962, 1968, 1975, 1982, 1990, 2006, 2011
  • Germany: 1819, 1970, 1987
  • Greece: 1971, 1981, 1991, 2001, 2011
  • Guinea: 1996
  • Honduras: 1988
  • Iceland: 1729, 1801, 1910
  • Indonesia: 1976, 1980, 1990, 1995, 2000, 2005, 2010
  • Iran: 2006, 2011
  • Iraq: 1997
  • Jamaica: 1991, 2001
  • Jordan: 2004
  • Kyrgyz Republic: 1999, 2009
  • Lesotho: 2006
  • Malawi: 2008
  • Malaysia: 1980, 1991
  • Mali: 1998, 2009
  • Mongolia: 1989, 2000
  • Morocco: 1994, 2004
  • Nicaragua: 1995, 2005
  • Nigeria: 2010
  • Norway: 1865, 1875, 1900, 1910
  • Papua New Guinea: 1980, 1990, 2000, 2011
  • Poland: 1978, 1988, 2002
  • Romania: 1977, 1992, 2002, 2011
  • Rwanda: 1991, 2002, 2012
  • Senegal: 2002
  • South Africa: 2007, 2011
  • Spain: 1981, 1991, 2001, 2011
  • Sweden: 1880, 1890, 1900, 1910
  • Thailand: 1980, 1990, 2000
  • Trinidad and Tobago: 2011
  • Uganda: 2002
  • Ukraine: 2001
  • United Kingdom: 1851a, 1851b, 1861a, 1861b, 1871, 1881a, 1881b, 1891a, 1891b, 1901a, 1901b, 1911
  • United States: 1850, 1880, 1910, 2000, 2010, 2015
  • Uruguay: 2011, 2011
  • Vietnam: 1989, 1999, 2009