Sample characteristics: Portugal

Census characteristics
  1981 1991 2001
Title of census XII Recenseamento Geral da População e II Recenseamento Geral da Habitação XIII Recenseamento Geral da População e III Recenseamento Geral da Habitação XIV Recenseamento Geral da População e IV Recenseamento Geral da Habitação
Census agency Portugal Instituto Nacional de Estatística (INE) Portugal Instituto Nacional de Estatística (INE) Portugal Instituto Nacional de Estatística (INE)
Population universe 9,833,014 9,867,147 10,356,117
De jure or de facto De Jure De Jure De Jure
Enumeration unit Dwelling Dwelling Dwelling
Census day March 16th, 1981 April 15, 1991 March 12, 2001
Field work period February to June 1981 March to July 1991 February to June 2001
Enumeration forms used One questionnaire for each of the following statistical units: building, housing unit, household, individual, and "collective questionnaire" (for groups of individuals presents but not residents). One questionnaire for each of the following statistical units: building, housing unit, private household, institutional household, individual and "collective questionnaire" (for groups of individuals presents but not residents). One questionnaire for each one of the following statistical units: building, housing unit, private household, institutional household, individual and "collective questionnaire" (for groups of individuals presents but not residents).
Type of field work Direct enumeration Direct enumeration Direct enumeration
Respondent Householder Householder Householder
Coverage Buildings 99.6%; dwellings 99.4%; households 99.2%; individuals 99.0% Buildings 99.7%; dwellings 99.5%; households 101.1%; individuals 100.7%

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Microdata sample characteristics
  1981 1991 2001
Microdata source Portugal Instituto Nacional de Estatística (INE) Portugal Instituto Nacional de Estatística (INE) Portugal Instituto Nacional de Estatística (INE)
Sample design Systematic, for every 20th dwelling/housing unit, excluding collective dwellings, with the start on the first dwelling of each one of the seven NUTS II. Persons living in the collective dwellings were selected apart but using the same methodological approach. Systematic, for every 20th dwelling/housing unit, excluding collective dwellings, with the start on the first dwelling of each one of the seven NUTS II. Persons living in the collective dwellings were selected apart but using the same methodological approach. Systematic, for every 20th dwelling/housing unit, excluding collective dwellings, with the start on the first dwelling of each one of the seven NUTS II. Persons living in the collective dwellings were selected apart but using the same methodological approach.
Sample unit Dwelling for private dwellings; person for collective dwellings Dwelling for private dwellings; person for collective dwellings Dwelling
Sample fraction 5% 5% 5%
Sample size (person records) 492,289 491,755 517,026
Sample weights Self-weighting (expansion factor=20) Self-weighting (expansion factor=20) Self-weighting (expansion factor=20)

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Units Identified in Microdata
  1981 1991 2001
Dwellings/housing units Yes Yes Yes
Vacant units Yes Yes Yes
Households (Private) Yes Yes Yes
Individuals Yes Yes Yes
Group quarters/Institutional Households Yes Yes Yes
Settled/Unsettled Population Yes, if we consider unsettled population as that one living in housing units not prepared for habitation. Yes, if we consider unsettled population as that one living in places housing units not prepared for habitation. Yes, if we consider unsettled population as that one living in places housing units not prepared for habitation.
Smallest geography Eurostat NUTS3 region and large city Eurostat NUTS3 region and large city Eurostat NUTS3 region and large city

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Unit Definitions (Census)
  1981 1991 2001
Dwellings Are structurally separate and independent and designed for permanent human habitation at a fixed location. They are not used wholly for other purposes at the time of the census or are actually used as the principal usual residence of at least one person at the time of the census. Are structurally separate and independent and designed for permanent human habitation at a fixed location. They are not used wholly for other purposes at the time of the census or are actually used as the principal usual residence of at least one person at the time of the census. Are structurally separate and independent and designed for permanent human habitation at a fixed location. They are not used wholly for other purposes at the time of the census or are actually used as the principal usual residence of at least one person at the time of the census.
Households (Private) Group of persons living at the same dwelling and that have kinship relations among them ("de jure" or "de facto"), regardless of occupying the whole or part of the housing unit. A person who lives alone in a separate housing unit or who occupies, as a lodger, a separate room (or rooms) of a housing unit, but does not have kinship relations with the other occupants. Group of persons living at the same dwelling and that have kinship relations among them ("de jure" or "de facto"), regardless of occupying the whole or part of the housing unit. A person who lives alone in a separate housing unit or who occupies, as a lodger, a separate room (or rooms) of a housing unit, but does not have kinship relations with the other occupants. Group of persons living at the same dwelling and that have kinship relations among them ("de jure" or "de facto"), regardless of occupying the whole or part of the housing unit. A person who lives alone in a separate housing unit or who occupies, as a lodger, a separate room (or rooms) of a housing unit, but does not have kinship relations with the other occupants.
Group quarters/Institutional Households Group of persons living in a collective housing unit (institution) that, regardless of the family relationship among them, they respect common rules, are beneficiaries of the purposes of the institution, and are ruled by a specific entity within or without that group. Group of persons living in a collective housing unit (institution) that, regardless of the family relationship among them, they respect common rules, are beneficiaries of the purposes of the institution, and are ruled by a specific entity within or without that group. Group of persons living in a collective housing unit (institution) that, regardless of the family relationship among them, they respect common rules, are beneficiaries of the purposes of the institution, and are ruled by a specific entity within or without that group.
Unsettled population Not available Not available Not available

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