Fernando GIL ALONSO Centre d’Estudis Demogràfics (Barcelona) fgil@ced. uab. es Presentation of the Spanish Censuses and Census Microdata Workshop “Integrating European Census Microdata” IPUMS Barcelona, 25 -27 July 2005
Structure of the presentation • Short history of the Spanish Censuses • Existing Census Microdata • Microdata for 1981, 1991 and 2001 Censuses: – Characteristics of Microdata for 1981, 1991 and 2001 Censuses; – Variables present in these Censuses: • Variables regarding population: demography, structure of the households, migrations, education, mobility and economic activity; • Variables regarding housing: household, housing, and house facilities; – Confidentiality; – Access to data.
Short history of the Spanish Censuses • The origins – “Vecindarios” and “fogatges” (16 th -17 th Centuries) – Parish archives (16 th - 19 th Centuries) • The first censuses – Censo de Aranda (1768) – Censo de Floridablanca (1787) – Censo de Godoy (1797) • The modern Censuses – 1857, 1860, 1887, 1897, 1900, 1910, 1920, 1930, 1940, 1950, 1960, 1970, 1981, 1991, 2001
Main features of 1981, 1991 and 2001 Censuses • The Spanish Censuses of 1981, 1991 and 2001 are “traditional” exhaustive censuses, but with differences between them at the methodological and conceptual levels: – 1981 Census: exploitation of 20 -25% of the questionnaires, depending on the province; – 1991 Census: exploitation of 100% of the questionnaires; absence of manual codification of variables; participation of regional governments, with specific questions; integration of information corresponding to dwellings and persons. – 2001 Census: combination of this census with municipal registers (“Padron”), reducing the number of question asked to citizens; exploitation of 100% of the questionnaires.
Existing Census Microdata The Spanish National Statistics Institute (INE) has microdata files for 1950, 1960, 1970, 1981, 1991 and 2001 Censuses, but the files from the first three censuses are in a non standard format. Therefore, the Spanish contribution to the IPUMS project is limited to the last three censuses: 1981, 1991 and 2001
Characteristics of the Microdata samples
Variables regarding population
Variables regarding population
Variables regarding population
Variables regarding housing
Variables regarding housing
Confidentiality Several measures have been implemented to guarantee the confidentiality of the microdata samples: – anonymization; – aggregation of characteristics defining small groups; – combination of geographic detail, conceptual detail and – sample size: 5% of microdata files on households at regional level (no information at a lower geographical level is included) – data use only allowed for research purposes (previous authorisation is required)
Access to data • For Census older than 1991 no microdata files are available - access to data to be negotiated directly with INE; • Diffusion plan for 1991 Census allows the access to microdata samples with two levels of territorial desegregation: national and provincial; • Data access has been facilitated for 2001 Census: data request can be done directly through internet (http: www. ine. es)
Links • SPANISH NATIONAL STATISTICS INSTITUTE: http: www. ine. es: • DEMOGRAPHIC STUDIES CENTRE: http: www. ced. uab. es • IPUMS: http: www. ipums. org/international
THANK YOU ! Fernando GIL ALONSO e-mail: fgil@ced. uab. es
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