1. www.statistik.atWe provide information Challenges in the transition from traditional to register- based census in Austria Conference of European Statisticians 60 th Plenary Session, Paris Manuela Lenk Statistics Austria Registers, Classifications and Methods Division 6 th – 8 th June 2012

2. www.statistik.atslide 2 | 6 June 2012 Evolution of the Austrian census 2001 Last traditional census High burden for respondents, considerable financial effort (72 million Euros) Register-based Census 2011 -- The Movie - YouTube Register-based Census 2011 -- The Movie - YouTube 2006 Register-based test census Methods, data procedures and use of registers were successfully tested 2009 Start of annual register-based labor market statistics Possibility for application and improvement of methods 2011 First complete register-based census No burden for respondents, costs reduced to 10 million Euros – Data from 7 base and 7 comparison registers (35 data holders)

3. www.statistik.atslide 3 | 6 June 2012 Register Based Census – Base Registers

4. www.statistik.atslide 4 | 6 June 2012 Data Privacy Protection – Unique keys

5. www.statistik.atslide 5 | 6 June 2012 Data Privacy Protection – Target swapping 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.

6. www.statistik.atslide 6 | 6 June 2012 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 OSSEX_CPRSEX_CSSRSEX_TRSEX_URSEX_VALIDRULE …………… …… ID3457111011 ID3458100012 ID3459020223 ID3460221124 …………… …… CPR=Central Population Register, CSSR=Central Social Security Register, TR=Tax Register, UR=Unemployment Register

7. www.statistik.atslide 7 | 6 June 2012 Residence Analysis bPIN OSCPRCSSRTRURSWRCAR ………………… 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?”

8. www.statistik.atslide 8 | 6 June 2012 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

9. www.statistik.atslide 9 | 6 June 2012 Quality framework

10. www.statistik.atslide 10 | 6 June 2012 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

11. www.statistik.atslide 11 | 6 June 2012 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

12. www.statistik.atslide 12 | 6 June 2012 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/S13P1.pdf  UNECE/Eurostat Expert Group Meeting on Register-Based Censuses 2010, The Hague http://live.unece.org/fileadmin/DAM/stats/documents/ece/ces/ge.41/2010/wp.4.e.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  European Conference on Quality in Official Statistics, June 2012 (forthcoming)

13. www.statistik.atslide 13 | 6 June 2012 Please address queries to: Manuela Lenk Register based census Contact information: Guglgasse 13, 1110 Vienna phone: +43 (1) 71128-8283 fax: +43 (1) 71128-7445 manuela.lenk@statistik.gv.at Challenges in the transition from traditional to register- based census in Austria Conference of European Statisticians 60 th Plenary Session, Paris