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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 0.05
Sample size (person records) 2084221
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.