The IECM project: Integrating the European Census Microdata IECM team* *A. Cabré, A. Esteve, J.Garcia, T. López, M. Valls www.iecm-project.org PROJECT OVERVIEW | DOCUMENTATION | HARMONIZATION | MICRODATA STRENGTHS International Satistical Institute, 56th Conference, Lisbon 2007. Centre d’Estudis Demogràfics
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The IECM project: Integrating the European Census Microdata IECM team* *A. Cabré, A. Esteve, J.Garcia, T. López, M. Valls PROJECT.
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The IECM project:
Integrating the European Census MicrodataIECM team*
*A. Cabré, A. Esteve, J.Garcia, T. López, M. Valls
International Satistical Institute, 56th Conference, Lisbon 2007.
IECM forms part of IPUMS international, a global collaboratory of National Statistical Offices and Universities to:
1. Inventory the world’s census microdata2. Preserve endangered microdata and documentation3. Integrate census microdata
a. use standards of UNSD, EuroSTAT, ISCO, ISCED, etc.
b. facilitate comparative research in time and space
4. Anonymize census microdata to preserve statistical confidentiality, using highest standards5. Disseminate restricted access, custom extracts to approved researchers at no cost
International Satistical Institute, 56th Conference, Lisbon 2007.
Integrated Documentation (sample designs)
METADATA :: Sample characteristics :: Portugal ( 1981 1991 2001 Selected All )
Census Characteristics 1981 1991 2001
Title XII Recenseamento Geral da Populaçao� e II Recenseamento Geral da Habita�çao
XIII Recenseamento Geral da Popula�çao e III Recenseamento Geral da Habita�çao
XIV Recenseamento Geral da Populaçao� e IV Recenseamento Geral da Habita�çao
Census Agency Portugal Instituto Nacional de Estat�istica (INE)
Portugal Instituto Nacional de Estat�istica (INE)
Portugal Instituto Nacional de Estat�istica (INE)
Population 9.833.014 9.867.147 10.356.117
Universe 100% 100% 100%
De jure or de facto De jure De jure De jure
Enumeration unit Dwelling Dwelling Dwelling
Census day 16 March 1981 15 April 1991 12 March 2001
Field work period February - June March - July February - June
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
Belarus 1999: All persons. France 1962-1990: All persons. Greece 1971-2001: All persons. Hungary 1970-2001: All persons. Portugal 1981-2001: All persons. Romania 1992-2002: All persons. Spain 1981-1991: All persons.
Description MARST describes the person's current marital status according to law or custom. Individuals who remarried should report the status relevant to their most recent marriage. Census instructions rarely explicitly limit marital status to strictly legal unions. Note regarding universe: The lowest age at which a person can be anything but "never married" varies among samples.
International Satistical Institute, 56th Conference, Lisbon 2007.
Harmonization II
Opportunity: Censuses share characteristics: similar topics (geographic, demographic, economic, education, household, migration characteristics of persons)
Challenge: Census employ different definitions, concepts (de jure vs de facto, households). Major reconciliation of these differences is a central effort for the project
International Satistical Institute, 56th Conference, Lisbon 2007.
Table 3 (eco). Compliance with UN classification of standard levels of current activity status AT91 AT01 ES91 ES01 FR62 FR68 FR75 FR82 FR90 FR99 GR91 GR01 HU90 HU01 NL01 RO92 RO02 UK91 Economically active Employed X X X X X X X X X X X X X X X X X Unemployed X X X X X X X X X X X X X X X X X Not economically active
Persons attending educational institutions X X X X X X X X X X X X X X X X
Pension or capital income recipients X X X X X X X X X X X X X X Homemakers X X X X X X X X X Others X X X X X X X X X X X X X X X X X Total number of categories* 8 13 10 11 10 7 6 6 6 7 9 19 7 9 9 9 10
*See annex 1 eco. for a complete list of the categories identified in each country
International Satistical Institute, 56th Conference, Lisbon 2007.
Table 4 (geo). Available levels of geographic detail 1st Level 2nd Level Austria 1991 Nuts (35) 2001 Nuts (35) Spain 1991 Province (52) Municipality > 20.000 inhabitants 2001 Province (52) Municipality > 20.000 inhabitants France 1962 Region (22) 1968 Region (22) 1975 Region (22) 1982 Region (22) 1990 Region (22) 1999 Region (22) Greece 1991 Department (55) 2001 Department (55) Hungary 1991 2001 Netherands 2001 Romania 1992 Region (8) 2002 Region (8) United Kingdom
International Satistical Institute, 56th Conference, Lisbon 2007.
“Census microdata are an invaluable resource – sample density and geographic coverage - for social science research but international comparisons based on these data are rarely attempted, partly because, for much of the world, are either unavailable or restricted, and are therefore seldom used.”