Challenges in the transition from traditional to register- based census in Austria

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Challenges in the transition from traditional to
register- based census in Austria
Manuela Lenk Statistics Austria Registers,
Classifications and Methods Division 6th 8th
June 2012

• Conference of European Statisticians 60th
  Plenary Session, Paris

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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)

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Register Based Census Base Registers
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Data Privacy Protection Unique keys
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Data Privacy Protection Target swapping

• 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.

Educational attainment
Educational attainment
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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

CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register
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Residence Analysis
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?
bPIN OS CPR CSSR TR UR SWR CAR

ID3457 ? ? ? ? ? ?
ID3458 ? ? ? ? ? ?
ID3459 ? ? ? ? ? ?
ID3460 ? ? ? ? ? ?

CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register, SWRRegister of Social Welfare Recipients, CARChild Allowance Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register, SWRRegister of Social Welfare Recipients, CARChild Allowance Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register, SWRRegister of Social Welfare Recipients, CARChild Allowance Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register, SWRRegister of Social Welfare Recipients, CARChild Allowance Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register, SWRRegister of Social Welfare Recipients, CARChild Allowance Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register, SWRRegister of Social Welfare Recipients, CARChild Allowance Register CPRCentral Population Register, CSSRCentral Social Security Register, TRTax Register, URUnemployment Register, SWRRegister of Social Welfare Recipients, CARChild Allowance Register
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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

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Quality framework
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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

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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 aspects
• quality of the register
• quality 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

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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
• 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 2011, Brussels
• http//www.cros-portal.eu/sites/default/files/S13P
  1.pdf
• UNECE/Eurostat Expert Group Meeting on
  Register-Based Censuses 2010, The Hague
• http//live.unece.org/fileadmin/DAM/stats/document
  s/ece/ces/ge.41/2010/wp.4.e.pdf
• European Conference on Quality in Official
  Statistics 2010, Helsinki

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Challenges in the transition from traditional to
register- based census in Austria
Please address queries to Manuela Lenk Register
based census Contact information Guglgasse 13,
1110 Vienna phone [phone] fax 43
(1) 71128-7445 manuela.lenk_at_statistik.gv.at
Conference of European Statisticians 60th
Plenary Session, Paris