Dutch Virtual Census
Presentation at the International Seminar on Population and Housing Censuses; Beyond the 2010 Round
27-29 November, 2012 Egon Gerards, The Netherlands
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Introducing Dutch Virtual CensusIntroducing Dutch Virtual Census
Short movie: Census Data http://youtu.be/SLpDkcyenf0
Dutch Virtual Census – Egon Gerards
Dutch Virtual Census
Presentation at the International Seminar on Population and Housing Censuses; Beyond the 2010 Round
27-29 November, 2012 Egon Gerards, The Netherlands
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OverviewOverview
The Dutch (Virtual) Census
Census based on the Social Statistical Database
Used methods
Advantages/disadvantages of a virtual census
Dutch Virtual Census – Egon Gerards
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History of the Dutch Census History of the Dutch Census
Traditional Census Ministry of Home Affairs: 1829, 1839,
1849, 1859, 1869, 1879, and 1889 Statistics Netherlands: 1899, 1909, 1920,
1930, 1947, 1960, and 1971
Experience of 1971: Unwillingness (non-response) and reduction expenses
No more traditional censuses
Dutch Virtual Census – Egon Gerards
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History of the Dutch CensusHistory of the Dutch Census
Alternative: virtual census
1981 and 1991: Population Register and surveys development 90’s; More and more registers used in the Census
2001 and 2011: based on an integrated set of registers and surveys: Social Statistical Database
Dutch Virtual Census – Egon Gerards
Definition:Comprehensive set of integrated micro-datafiles with coherent and detailed demographic and socio-economic data on persons, households, dwellings, jobs, and benefits
Two versions of the SSD:“fast” SSD (fast, regular statistics)micro integrated SSD (high-quality, longitudinally consistent statistics)
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What is the Social Statistical Database?What is the Social Statistical Database?
Dutch Virtual Census – Egon Gerards
Legal base (Statistics Act) Public approval (‘Big Brother is watching you’) Cooperation among authorities (mainly
government organisations) Comprehensive and reliable register system
(administrative versus statistical quality) Unified identification system (preferably unique
ID-numbers)
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Facilitating use of administrative sourcesFacilitating use of administrative sources
Dutch Virtual Census – Egon Gerards
Census and SSD data sourcesCensus and SSD data sources
Population Register Jobs file, containing all employees Self-employed file, containing all self-employed Fiscal administration Social Security administrations Pensions and life insurance benefits Housing register
Labour Force Survey data around Census Day
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registers
survey
Dutch Virtual Census – Egon Gerards
Micro linkage
Micro integration
Weighting technique
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Combining sources; from data to tablesCombining sources; from data to tables
Dutch Virtual Census – Egon Gerards
Linkage key Registers: Citizen Service Number, unique Surveys: Sex, date of birth, address (postal code and
house number)
Linkage key replaced by RIN-person (confidentiality)
Linkage strategy Optimizing number of matches Minimizing number of mismatches and missed
matches
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Micro linkageMicro linkage
Dutch Virtual Census – Egon Gerards
Micro integration aims at improving data quality in combined sources by searching and correcting for errors on unit level
Collecting data from several sources; more comprehensive and coherent information on aspects of a person’s lifeCompare sources: coverage and conflicting information (reliability of sources)Integration rules: checks, adjustments, imputationsOptimal use of information; quality improves
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Micro integrationMicro integration
Dutch Virtual Census – Egon Gerards
Creating register-survey tables
Demand for overall numerical consistency one figure for one phenomenon idea all tables based on different sources (e.g. surveys)
should be mutually consistent
Repeated Weighting (RW): technique to achieve numerical consistency
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Repeated weightingRepeated weighting
Dutch Virtual Census – Egon Gerards
Collection of administrative registers Surveys only additional and existing No additional data collection Linking the sources Micro integration Estimation/Weighting
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Dutch Virtual CensusDutch Virtual Census
testDutch Virtual Census – Egon Gerards
Relatively cheap (small cost per inhabitant) Quick (short production time) Less problems with non-response It can be done permanently!
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Advantages Virtual CensusAdvantages Virtual Census
Dutch Virtual Census – Egon Gerards
Dependent on register holders (statistics is not their priority) Timeliness of registers Concepts and population of registers may differ from what is
needed (keep good relations with the register holders!) Publication of small subpopulations sometimes difficult or
even impossible because of limited information in already existing surveys
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Disadvantages Virtual CensusDisadvantages Virtual Census
testDutch Virtual Census – Egon Gerards
More information about the Dutch traditional Censuses (including those of 1960 and 1971) http://www.volkstellingen.nl/en/
One percent samples for three years (1960, 1971 and 2001) IPUMS (Integrated Public Use Microdata Series) http://www.ipums.org/international/index.html
Microdata sets for all three above years available for research! DANS (Data Archiving and Networked Services) http://www.dans.knaw.nl/en/
Centre for Policy Related Statistics; research for commissioned work and remote access to microdata for research: www.cbs.nl/cvb
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Statistics Netherlands: microdata availabilityStatistics Netherlands: microdata availability
testDutch Virtual Census – Egon Gerards
300 km long, 200 km wide Quarter of the land below sea level 16,7 million people Densily populated: 500 persons / km2
Kingdom: Queen Beatrix
Thank you for your attention!
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The NetherlandsThe Netherlands
Dutch Virtual Census – Egon Gerards
Tables 2001 http://www.cbs.nl/nl-NL/menu/themas/dossiers/historische-reeksen/publicaties/volkstelling-2001/2003-volkstelling-excel.htm
Book and extra chapter 2001 http://www.cbs.nl/nl-NL/menu/themas/dossiers/historische-reeksen/publicaties/volkstelling-2001/2001-b57-pub.htm
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More information Census 2001More information Census 2001
Dutch Virtual Census – Egon Gerards