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METADATA :: Sample characteristics :: Portugal (1981 1991 2001 Selected All )

Census Characteristics	1991
Title	XIII Population Census and III Household Census
Census Agency	Portugal Instituto Nacional de Estatistica (INE)
Population	9.867.147
Universe	100%
De jure or de facto	De jure
Enumeration unit	Dwelling
Census day	15 April 1991
Field work period	March - July
Enumeration forms used	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 field work	Direct enumeration
Respondent	Householder
Coverage	Buildings-99,60%; Dwellings- 99,42%;households-99,24%; individuals-99,04%
Microdata sample characteristics	1991
Sample microdata source	Portugal Instituto Nacional de Estatistica (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 seleceted apart but using the same methodological approach.
Sample unit	Dwelling for private dwellings; person for collective dwellings
Sample fraction	5 %
Sample fraction (private households)	-
Sample fraction (institutional households)	-
Sample size (person records)	491.755
Sample size (private households)	-
Sample size (institutional households)	-
Sample weights	Self-weighting (expansion factor=20)
Units identified	1991
Dwellings	Yes
Vacant units	Yes
Households	Yes
Individuals	Yes
Group quarters	Yes
Settled/unsettled Population	Yes, if we consider unset
Special populations	No
Unit definitions	1991
Dwellings	Are structurally separate and independent and designed for permanent human habitation at a fixed location. They are not used wholly for other pruposes 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 units. A person who lives alone in a separate housing unit or who occupies, as a logder, a separate room (or rooms) of a housing unit, but does not have kinship relations with the others occupants.
Institutional population	Group of persons living in a collective housing unit (institutional) that, regardless of the family relationship among them, they respect common rules, are beneficiaries of the purposes of the institution, and are ruled bu a specific entity within or without that group.
Group quarters	Group of persons living in a collective housing unit (institutional) that, regardless of the family relationship among them, they respect common rules, are beneficiaries of the purposes of the institution, and are ruled bu a specific entity within or without that group.
Unsettled population	Not available