Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is defined as living accommodation which is occupied or, of vacant, is intended for occupation, by one household. - Group quarters: A non-private household is a boarding house, hotel, guest house, barrack, hospital, nursing home, boarding schools, religious institution, welfare institution, prison, or ship, etc. However, proprietors and manager of hotels, principals of boarding schools, persons in charge of various other types of institutions and members of staff who, with their families, occupy flats on the premises are considered as private households.
All persons present in Ireland at the time of census, including visitors and those in residence. Usual residents temporarily absent from the State and members of the Defence Forces, who on Census night, were serving abroad with the United Nations were excluded.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 344,291
Face-to-face [f2f]
There are 2 forms to be completed by households or individuals: (1) Form A - Census Household Schedule; and (2) Form A(P) - completed by persons in certain circumstances. The information from Form A is used here.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is defined as living accommodation which is occupied or, if vacant, is intended for occupation, by one household. - Group quarters: A non-private household is a boarding house, hotel, guest house, barrack, hospital, nursing home, boarding schools, religious institution, welfare institution, prison, or ship, etc. However, proprietors and manager of hotels, principals of boarding schools, persons in charge of various other types of institutions and members of staff who, with their families, occupy flats on the premises are considered as private households.
All persons present in Ireland at the time of census, including visitors and those in residence. Usual residents temporarily absent from the State and members of the Defence Forces, who on Census night, were serving abroad with the United Nations were excluded.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 355,020
Face-to-face [f2f]
There are 2 forms to be completed by households or individuals: (1) Form A - Census Household Schedule; and (2) Form A(P) - completed by persons in certain circumstances. The information from Form A is used here.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Dwellings: A dwelling is a self contained living accommodation which is occupied or, if vacant, is intended for occupation, by one or more households. - Group quarters: Communal Establishments (CEs) or non-private households are establishments providing managed (full-time or part-time supervision) residential accommodation. This includes hotel, boarding house, guest house, bed and breakfast, hostel, educational establishment, religious community, children's home, nursing home, hospital/nurses' home, prison, defence establishment (including ships), civilian ships, boats and barges, garda station, and holiday campsite. Boarding houses with less than five boarders on Census Night are treated as private households.
All persons present in Ireland on the census night, including visitors and those in residence. Usual residents who were temporarily absent were included but asked a subset of questions.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 474,353
Face-to-face [f2f]
There are 3 forms completed by the public: a. Household Form (main census form); b. Listing Form (for communal establishments only); and c. Individual Form. The information from the Household Form is used here.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Group quarters: A non-private household is a boarding house, hotel, guest house, barrack, hospital, nursing home, boarding schools, religious institution, welfare institution, prison, or ship, etc. However, proprietors and manager of hotels, principals of boarding schools, persons in charge of various other types of institutions and members of staff who, with their families, occupy flats on the premises are considered as private households.
All persons present in Ireland at the time of census, including visitors and those in residence. Usual residents temporarily absent from the State and members of the Defence Forces, who on Census night, were serving abroad with the United Nations were excluded.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 337,686
Face-to-face [f2f]
The information is based on Form A - Household Schedule.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is defined as living accommodation which is occupied or, if vacant, is intended for occupation, by one household. - Group quarters: A non-private household is a boarding house, hotel, guest house, barrack, hospital, nursing home, boarding schools, religious institution, welfare institution, prison, or ship, etc. However, proprietors and manager of hotels, principals of boarding schools, persons in charge of various other types of institutions and members of staff who, with their families, occupy flats on the premises are considered as private households.
All persons present in Ireland at the time of census, including visitors and those in residence. Usual residents temporarily absent from the State and members of the Defence Forces, who on Census night, were serving abroad with the United Nations were excluded.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 353,149
Face-to-face [f2f]
There are 2 forms to be completed by households or individuals: (1) Form A - Census Household Schedule; and (2) Form A(P) - completed by persons in certain circumstances. The information from Form A is used here.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is living accommodation which is occupied or, if vacant, is intended for occupation, by one or more households. - Group quarters: Examples of non-private households are establishments or institutions. These include hotels, country clubs, guest houses, B&Bs, boarding houses, hostel, semiary, monastery or convent, hospital, nurses' home, nursing home, county home, orphanage, boarding school, garda stations, and military barracks.
All persons present in Ireland on the census night, including visitors and those in residence. Usual residents who were temporarily absent were excluded.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 365,323
Face-to-face [f2f]
There are 2 forms to be completed by households or individuals: (1) Form A - Census Form (or Schedule); and (2) Form A(P) - Personal Form. The information from Form A is used here.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is living accommodation which is occupied or, if vacant, is intended for occupation, by one or more households. - Group quarters: Communal Establishments (CEs) or non-private households, including, hotel, boarding house, guest house, bed and breakfast, hostel, educational establishment, religious community, children's home, nursing home, hospital/nurses' home, prison, defence establishment (including ships), civilian ships, boats and barges, garda station, and holiday campsite
All persons present in Ireland on the census night, including visitors and those in residence. Usual residents who were temporarily absent were included but asked a subset of questions.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 440,314
Face-to-face [f2f]
There are 4 forms completed by the public: a. Household Form (main census form); b. Listing Form ; c. Individual Form ; and d. Large Print Form. The information from the Household Form is used here.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is living accommodation which is occupied or, if vacant, is intended for occupation, by one or more households. - Group quarters: Communal Establishments (CEs) or non-private households, including, hotel, boarding house, guest house, bed and breakfast, hostel, educational establishment, religious community, children's home, nursing home, hospital/nurses' home, prison, defence establishment (including ships), civilian ships, boats and barges, garda station, and holiday campsite
All persons present in Ireland on the census night, including visitors and those in residence. Usual residents who were temporarily absent were included but asked a subset of questions.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 410,688
Face-to-face [f2f]
There are 5 forms completed by the public: a. Household Form ; b. Continuation Form; c. Listing Form ; d. Individual Form ; and d. Large Print Form. The information from the Household Form is us\ed here.
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system.
The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.
National coverage
Household
UNITS IDENTIFIED: - Dwellings: No - Vacant units: No - Households: Yes - Individuals: Yes - Group quarters: Yes
UNIT DESCRIPTIONS: - Dwellings: Permanent structures consisting of walls and a roof (whether or not intended for occupation and whether or not occupied on Census night). - Group quarters: A non-private household is a boarding house, hotel, guest house, barrack, hospital, nursing home, boarding schools, religious institution, welfare institution, prison, or ship, etc. However, proprietors and manager of hotels, principals of boarding schools, persons in charge of various other types of institutions and members of staff who, with their families, occupy flats on the premises are considered as private households.
All persons present in Ireland at the time of census, including visitors and those in residence. Usual residents temporarily absent from the State and members of the Defence Forces, who on Census night, were serving abroad with the United Nations were excluded.
Census/enumeration data [cen]
MICRODATA SOURCE: Central Statistics Office
SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.
SAMPLE UNIT: Household
SAMPLE FRACTION: 10%
SAMPLE SIZE (person records): 296,878
Face-to-face [f2f]
There are 5 forms: Form A (Basic household Census form), Form B (summary of the population figures), Form C (summary of the household and population figures), Form D (for communal establishments), Form N (relevant note sto be attached with Form A) and Form P (for enumerations of guests in hotels and guest houses). The information from Form A is used here.
Not seeing a result you expected?
Learn how you can add new datasets to our index.
Attribution 4.0 (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
License information was derived automatically
IPUMS-International is an effort to inventory, preserve, harmonize, and disseminate census microdata from around the world. The project has collected the world's largest archive of publicly available census samples. The data are coded and documented consistently across countries and over time to facillitate comparative research. IPUMS-International makes these data available to qualified researchers free of charge through a web dissemination system. The IPUMS project is a collaboration of the Minnesota Population Center, National Statistical Offices, and international data archives. Major funding is provided by the U.S. National Science Foundation and the Demographic and Behavioral Sciences Branch of the National Institute of Child Health and Human Development. Additional support is provided by the University of Minnesota Office of the Vice President for Research, the Minnesota Population Center, and Sun Microsystems.