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Challenges in the transition from traditional to register- based census in AustriaHigh-level Seminar on Population Censuses and Migration Statistics
Manuela LenkStatistics Austria
Head of unit register-based Census
16th – 18th October 2013
www.statistik.at slide 2 | October 2013
Evolution of the Austrian census
2001 Last traditional censusHigh burden for respondents, considerable financial effort (72 million Euros) Register-based Census 2011 -- The Movie - YouTube
2006 Register-based test censusMethods, data procedures and use of registers were successfully tested
2009 Start of annual register-based labor market statisticsPossibility for application and improvement of methods
2011 First complete register-based censusNo burden for respondents, costs reduced to 10 million Euros – Data from 7 base and 7 comparison registers (35 data holders)
www.statistik.at slide 3 | October 2013
Register Based Census – Base Registers
www.statistik.at slide 4 | October 2013
Data Privacy Protection – Unique keys
www.statistik.at slide 5 | October 2013
Data Privacy Protection – Target swapping
Educational
attainment Educational attainment
Target-swapping Detect risky records that could be identified because of their specific combination of attributes Exchange single attributes of those records with the characteristics of another individual.
www.statistik.at slide 6 | October 2013
The principle of redundancy
Same attribute in more than one register Comparison registers are used to confirm the values in the base
registers due to quality improvement
bPIN OS SEX_CPR SEX_CSSR SEX_TR SEX_UR SEX_VALID RULE
… … … … … … …
ID3457 1 1 1 0 1 1
ID3458 1 0 0 0 1 2
ID3459 0 2 0 2 2 3
ID3460 2 2 1 1 2 4
… … … … … … …
CPR=Central Population Register, CSSR=Central Social Security Register, TR=Tax Register, UR=Unemployment Register
www.statistik.at slide 7 | October 2013
Residence Analysis
bPIN OS CPR CSSR TR UR SWR CAR
… … … … … … …
ID3457 ID3458 ID3459 ID3460
… … … … … … …
CPR=Central Population Register, CSSR=Central Social Security Register, TR=Tax Register, UR=Unemployment Register, SWR=Register of Social Welfare Recipients, CAR=Child Allowance Register
Persons who are only recorded in the CPR receive a letter containing the question: “Did you have your main residence in Austria at the reference date? – Yes or No?”
www.statistik.at slide 8 | October 2013
From Raw Data to the Final Data Pool
Raw data The single registers provided by the data holders Every register authority delivers the bPINs
Census Database The combined information from the registers The key for data merging is the bPIN_OS
Final Data Pool The final data after imputations by the NSI
RAW CDB FDP
www.statistik.at slide 9 | October 2013
Quality Framework
www.statistik.at slide 10 | October 2013
Quality assessment
Independence of the quality framework The framework is closely tied to the data flow, but independent from the processing to evaluate the process without influencing it.
Calculation of quality indicators Quality indicators are derived for each attribute in each register. Further these measures are calculated for the raw data level, CDB and FDP.
Hyperdimensions The hyperdimensions cover a) the quality of data generation and documentation b) the detection of formal errors, missing primary keys and non- response c) a comparison of census data with an external source
www.statistik.at slide 11 | October 2013
Potentials and perspectives
Quality indicators on register level - each attribute in each register is associated with a quality indicator - indicators can also be used for other projects and deliver essential information about the quality
Quality indicators for the Final Data Pool of register-based statistics
- indicator for each attribute which covers all quality-related aspectsquality of the registerquality of imputations
- The experience gained with the new census type can be of use for other population and household surveys - The quality framework can be used for other register-based statistics
www.statistik.at slide 12 | October 2013
Further Information
Austrian Journal of Statistics, Volume 39 (2010), Number 4• http://www.stat.tugraz.at/AJS/ausg104/104Berka.pdf
Statistica Neerlandica, Volume 66 (2012), Issue 1• http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9574.2011.00506.x/pdf
Journal of Official Statistics, Ćetković et al. (forthcoming)
ESSnet on Data Integration 2011, Madrid• http://www.ine.es/e/essnetdi_ws2011/ppts/Lenk.pdf
ISI World Statistics Congress STS50 - Methods and quality of administrative data used in a census 2011, Dublin• http://isi2011.congressplanner.eu/pdfs/650199.pdf
NTTS Conference 2013, Brussels• http://www.cros-portal.eu/sites/default/files/NTTS2013fullPaper_84.pdf
UNECE 2013 - Selected national experiences in the 2010 census round, Geneva• http://www.unece.org/fileadmin/DAM/stats/documents/ece/ces/ge.41/2013/census_meeting/28_E_Rev.1.pdf
European Conference on Quality in Official Statistics 2010, Helsinki• http://q2010.stat.fi/media//presentations/session-26/fiedler_quality-in-official-statistics_statisticsaustria_paper.pdf
www.statistik.at slide 13 | 6 June 2012
Please address queries to:Manuela Lenk
Register based census
Contact information:Guglgasse 13, 1110 Viennaphone: +43 (1) 71128-8283
fax: +43 (1) [email protected]
Challenges in the transition from traditional to register- based census in AustriaHigh-level Seminar on Population Censuses and Migration Statistics
