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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 0.05
Sample size (person records) 492289
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