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Sample characteristics: Portugal

Census/survey characteristics
Type Census
Title XII Recenseamento Geral da População e II Recenseamento Geral da Habitação
Statistical agency Portugal Instituto Nacional de Estatística (INE)
De jure or de facto De jure
Census/survey day March 16, 1981
Field work period February to June 1981
Questionnaire 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).
Type of fieldwork Direct enumeration
Microdata sample characteristics
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.
Sample fraction 5%
Sample size (person records) 492,289
Sample weights Self-weighting (expansion factor=20)
Units identified in microdata
Dwellings Yes
Vacant units Yes
Households Yes
Collective dwellings Yes
Smallest geography Eurostat NUTS3 region and large city
Unit definitions
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.
Households 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.
Collective dwellings 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.
Special populations Persons living in units not prepared for habitation
Census/survey characteristics
Type Census
Title XIII Recenseamento Geral da População e III Recenseamento Geral da Habitação
Statistical agency Portugal Instituto Nacional de Estatística (INE)
De jure or de facto De jure
Census/survey day April 15, 1991
Field work period March to July 1991
Questionnaire 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).
Type of fieldwork Direct enumeration
Microdata sample characteristics
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.
Sample fraction 5%
Sample size (person records) 491,755
Sample weights Self-weighting (expansion factor=20)
Units identified in microdata
Dwellings Yes
Vacant units Yes
Households Yes
Collective dwellings Yes
Smallest geography Eurostat NUTS3 region and large city
Unit definitions
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.
Households 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.
Collective dwellings 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.
Special populations Persons living in units not prepared for habitation
Census/survey characteristics
Type Census
Title XIV Recenseamento Geral da População e IV Recenseamento Geral da Habitação
Statistical agency Portugal Instituto Nacional de Estatística (INE)
De jure or de facto De jure
Census/survey day March 12, 2001
Field work period February to June 2001
Questionnaire 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 fieldwork Direct enumeration
Microdata sample characteristics
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.
Sample fraction 5%
Sample size (person records) 517,026
Sample weights Self-weighting (expansion factor=20)
Units identified in microdata
Dwellings Yes
Vacant units Yes
Households Yes
Collective dwellings Yes
Smallest geography Eurostat NUTS3 region and large city
Unit definitions
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.
Households 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.
Collective dwellings 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.
Special populations Persons living in units not prepared for habitation
Census/survey characteristics
Type Census
Title Censos 2011: XV Receseamento Geral da População; V Receseamento Geral da Habitação
Statistical agency Instituto Nacional de Estatística (INE)
Population universe All persons who were in the country at 12am on 21 March 2011
De jure or de facto De jure and de facto
Census/survey day March 21, 2011
Field work period March 21 - April 24, 2011
Questionnaire Three separate enumeration forms were used to collect information on the dwelling, household, and individuals.
Type of fieldwork Direct and self-enumeration. Some households self-enumerated using paper forms distributed by enumerators; other households self-enumerated online.
Microdata sample characteristics
Sample design Systematic sample of every 20th household with a random start, drawn by the country
Sample fraction 5%
Sample size (person records) 528,870
Sample weights Self-weighting (expansion factor = 20).
Units identified in microdata
Dwellings No
Vacant units No
Households Yes
Collective dwellings Yes
Smallest geography Eurostat NUTS3 region
Unit definitions
Dwellings A dwelling is an enclosed and independent place that is built, rebuilt, expanded, transformed or used exclusively for living purposes during the reference period.
Households A conventional household is a group of people who reside in the same dwelling and have legal or de facto relationships with each other, and occupy an entire dwelling or part of a dwelling. Additionally, one independent person who occupies part of or the entire dwelling constitutes a conventional household.
Collective dwellings An institutional household is a group of people residing within a collective dwelling whom, regardless of family relationships between them, observe a common discipline, are beneficiaries of the objectives of an institution, and are governed by an internal or external entity of the group. Only individuals who had lived in the institution for more than a year, or were going to live there for at least 12 months were enumerated in the institution.