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Sample characteristics: Spain

Census/survey characteristics
Type Census
Title Census of Population and Housing 1981, Spain
Statistical agency Instituto Nacional de Estadisticas (INE)
Population universe The census includes persons who have a fixed residence in the national territory as well as those who are in the national territory at the time of reference, without omissions nor duplications. The persons who have their residency in Spain constitute the fixed population [population with rights]. The persons who are in the national territory at the moment of the census form the actual population [de facto].
De jure or de facto De jure and de facto
Census/survey day March 1, 1981
Questionnaire Two types of questionnaires will be used: one for the population that lives in family dwellings and another for the population that lives in collective dwellings.
Type of fieldwork The questionnaires are prepared to utilize the method of self-enumeration, with which the mission of the Agent is reduced, generally, to the tasks of delivering and collecting the questionnaires and verifying the correct completion of the same.
Microdata sample characteristics
Sample design Systematic stratified sampling. The provinces of Alava, Guipuzcoa, Navarra, and Vizcaya were over-sampled at roughly 5 times the rate of other provinces.
Sample fraction 5%
Sample size (person records) 2,084,221
Sample weights Computed by census agency. Use of weights is strongly recommended because of oversampling of several provinces.
Units identified in microdata
Dwellings Yes
Vacant units Yes
Households Yes
Collective dwellings Yes
Smallest geography Municipalities with 20,000+ population
Unit definitions
Dwellings A dwelling is a structurally separate and independent location that, given the way it was built, rebuilt, transformed, or adapted, is conceived to be inhabited by persons, or, even if this is not the case, is effectively and actually inhabited at the time
Households The family [household] is defined as a group of persons, generally linked because they are relatives, who live together, normally occupying the totality of a dwelling. Persons in domestic services who spend the night in the dwelling and guests who are part of the family group will be included as family.
Collective dwellings Collective dwellings are those dwellings or buildings designed to be occupied by persons who do not constitute a family, subject to a common regime or authority, or gathered by common objectives or interests.
Special populations [Alojamiento] "Lodging" refers to those units that do not qualify as dwelling because they are mobile, semi-permanent or improvised or because they have not been conceived for residential purposes but were occupied during the census.
Census/survey characteristics
Type Census
Title Census of Population and Housing 1991, Spain
Statistical agency Instituto Nacional de Estadisticas (INE)
Population universe The census includes persons who have a fixed residence in the national territory as well as those who are in the national territory at the time of reference, without omissions nor duplications. The persons who have their residency in Spain constitute the fixed population [population with rights]. The persons who are in the national territory at the moment of the census form the actual population [de facto].
De jure or de facto De jure
Census/survey day March 1, 1991
Field work period March 1 to April 1, 1991
Questionnaire There are five forms: general questionnaire, individual questionnaire, collective [dwelling] questionnaire, secondary dwellings with no registered dwellers, and 1990 building questionnaire.
Type of fieldwork The questionnaires are prepared to utilize the method of self-enumeration, with which the mission of the Agent is reduced, generally, to the tasks of delivering and collecting the questionnaires and verifying the correct completion of the same.
Microdata sample characteristics
Sample design Systematic stratified sample
Sample fraction 5%
Sample size (person records) 1,931,458
Sample weights Computed by census agency and should be used for most types of analysis.
Units identified in microdata
Dwellings Yes
Vacant units Yes
Households Yes
Collective dwellings Yes
Smallest geography Municipalities with 20,000+ population
Unit definitions
Dwellings A dwelling is a structurally separate and independent location that, given the way it was built, rebuilt, transformed, or adapted, is conceived to be inhabited by persons, or, even if this is not the case, is effectively and actually inhabited at the time of the census.
Households A household is the group of people who, residing in the same dwelling, share expenses derived from the use of the dwelling and/or alimentation. Single person and multiperson households are to be considered.
Collective dwellings Collective dwellings are those dwellings or buildings designed to be occupied by persons who do not constitute a family, subject to a common regime or authority, or gathered by common objectives or interests.
Special populations [Alojamiento] "Lodging" refers to those units that do not qualify as dwelling because they are mobile, semi-permanent or improvised or because they have not been conceived for residential purposes but were occupied during the census.
Census/survey characteristics
Type Census
Title Census of Population and Housing 2001, Spain
Statistical agency Instituto Nacional de Estadisticas (INE)
Population universe Residents: persons who at the time of the census habitually reside in Spain. This excludes those persons who were in Spain at the time of the census, but did not reside there. The only exception are citizens and residents temporarily abroad.
De jure or de facto De jure
Census/survey day November 1, 2001
Field work period The field work period will last two months.
Questionnaire The are four forms: the dwelling, censal data, household data, and individual data forms.
Type of fieldwork The enumerator is the main form of data collection. However, data can be provided by telephone or internet. The forms are designed to allow the respondents to fill them without any help.
Microdata sample characteristics
Sample design Systematic stratified sample
Sample fraction 5%
Sample size (person records) 2,039,274
Sample weights Expansion factor = 20.
Units identified in microdata
Dwellings Yes
Vacant units Yes
Households Yes
Collective dwellings Yes
Smallest geography Municipalities with 20,000+ population combined by IPUMS
Unit definitions
Dwellings A dwelling is a structurally separate and independent location that, given the way it was built, rebuilt, transformed, or adapted, is conceived to be inhabited by persons, or, even if this is not the case, is effectively and actually inhabited at the time of the census.
Households Group of people residing in the same family dwelling. Sharing of expenses is not required. Family dwellings are those inhabited by one or more persons usually, but not necessarily, having kindred ties and who do not constitute a group quartes [see definition below].
Collective dwellings Collective dwellings are those dwellings or buildings designed to be occupied by persons who do not constitute a family, subject to a common regime or authority, or gathered by common objectives or interests.
Special populations Lodging is a family dwelling that is mobile, semi-permanent, or improvised or even if it was not intended for residential purposes, is inhabited at the time of the census.
Census/survey characteristics
Type Census
Title Censos de Población y Viviendas 2011
Statistical agency INE (Instituto Nacional de Estadística)
Population universe Habitual residents of the national territory, including diplomatic personnel and other Spanish functionaries and their families who live abroad, the Spanish personnel of the merchant navy, fishing boats, and aerial navigation that are found outside the country at the time of the census, Spanish residents that are temporarily working abroad, and foreign residents that are temporarily abroad.
De jure or de facto De jure
Census/survey day November 1, 2011
Field work period September 2011 to March 2012
Questionnaire A single enumeration form requested information on the dwelling and individuals.
Type of fieldwork Combination of direct enumeration and register-based data collection
Microdata sample characteristics
Sample design Systematic sample of every 10th dwelling, drawn by the country
Sample fraction 10%
Sample size (person records) 4,107,465
Sample weights Weights computed by census agency should be used for most types of analysis.
Units identified in microdata
Dwellings No
Vacant units No
Households Yes
Collective dwellings No
Smallest geography Municipality
Unit definitions
Dwellings Structurally separate or independent enclosure that, because of the way in which it was constructed, reconstructed, transformed, or adapted, is intended for habitation by people, or, if this was not the case, it is used for habitation at the time of the census. As an exception,enclosures that, even having been intended initially for human habitation, at the time of the census are completely dedicated to other purposes are not considered dwellings.
Households A group of people residing in the same dwelling not necesariily related or a single individual
Collective dwellings Dwellings designed to be occupied by a group of people subject to a common authority or common regimen not based on family or shared-living connections. Hotels, camps, and institutions (hospitals, prisons, residencies, etc.) are included in this category.