Census characteristics |
|
1981 |
1991 |
2001 |
Title of census |
XII Recenseamento Geral da População e II Recenseamento Geral da Habitação |
XIII Recenseamento Geral da População e III Recenseamento Geral da Habitação |
XIV Recenseamento Geral da População e IV Recenseamento Geral da Habitação |
Census agency |
Portugal Instituto Nacional de Estatística (INE) |
Portugal Instituto Nacional de Estatística (INE) |
Portugal Instituto Nacional de Estatística (INE) |
Population universe |
9,833,014 |
9,867,147 |
10,356,117 |
De jure or de facto |
De Jure |
De Jure |
De Jure |
Enumeration unit |
Dwelling |
Dwelling |
Dwelling |
Census day |
March 16th, 1981 |
April 15, 1991 |
March 12, 2001 |
Field work period |
February to June 1981 |
March to July 1991 |
February to June 2001 |
Enumeration forms used |
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). |
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). |
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 field work |
Direct enumeration |
Direct enumeration |
Direct enumeration |
Respondent |
Householder |
Householder |
Householder |
Coverage |
— |
Buildings 99.6%; dwellings 99.4%; households 99.2%; individuals 99.0% |
Buildings 99.7%; dwellings 99.5%; households 101.1%; individuals 100.7% |
Microdata sample characteristics |
|
1981 |
1991 |
2001 |
Microdata source |
Portugal Instituto Nacional de Estatística (INE) |
Portugal Instituto Nacional de Estatística (INE) |
Portugal Instituto Nacional de Estatística (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 selected apart but using the same methodological approach. |
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. |
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 unit |
Dwelling for private dwellings; person for collective dwellings |
Dwelling for private dwellings; person for collective dwellings |
Dwelling |
Sample fraction |
5% |
5% |
5% |
Sample size (person records) |
492,289 |
491,755 |
517,026 |
Sample weights |
Self-weighting (expansion factor=20) |
Self-weighting (expansion factor=20) |
Self-weighting (expansion factor=20) |
Unit Definitions (Census) |
|
1981 |
1991 |
2001 |
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. |
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. |
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 (Private) |
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. |
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. |
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. |
Group quarters/Institutional Households |
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. |
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. |
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. |
Unsettled population |
Not available |
Not available |
Not available |