1. The effect of changing regional classifications on statistical indicators October 2008, Shanghai Dr. Udo Maack Germany SCORUS Conference 2008

2. Changing Regional Classifications 1.The role and characteristics of regional statistical indicators 2.What happens when regional classification changes? 3.Provisions to avoid a false reporting? Recalculation procedure Regional Classification Server (structure and products)

3. 1. The role and characteristics of regional statistical indicators  Describe real world phenomena  Measure developments in time series  Compare between regions of … – one country – different countries (international)  Values must be normalized e.g. using area or population or (…)

4. 2. What happens when regional classification changes?

5. Which changes may occur? (I) Number of Provinces in Turkey between 1990 ( Census) and 1999 68 70 72 74 76 78 80 82 Census 1990 199119921993199419951996199719981999

6. Which changes may occur? (II)

7. 3. Provisions to avoid a false reporting? (1) Provide a centrally maintained Regional Classification Server (RCS) (2) Recalculate values and indicators (3) Force the use of the newest classification on all production steps

8. Role of a central Regional Classification Server Report B Report A GeoCoding Statistical Production Process A (Population) Central RCS spatial analysis comparison, combination Statistical Production Process B (Hospital) Feedback / Recalculation / Recalculation

9. Role of a central Regional Classification Server External Data Production Regional Statistics DB RCS Manually prepared Uploading Internal Data Production Meta Database

10. Solution for the Turkish National Statistical Office TURKSTAT (under development) External Data Provider Regional Statistics DB Address DB RCS Quality assured Workflow for Uploading Data Production Meta Database National Address DB

11. Recalculation of Values and Indicators Basic - Values If surveyed / reported values are available, these values have to be aggregated from the original level to regional units according the new territorial division Indicators must be calculated again from the basis values on all regional level not available, the existing values have to be recalculated using weighting factors – of other sources, if available preferred – derived from change of area or population, which have to be provided in the RCS

12. Results of the recalculation of values

13. Basic structure of a RCS (I) Standard Information: description of regional units with lifetime Area Population ToFrom IdentifierName timeLifeUnit

14. Basic structure of a RCS (I) Example

15. Basic structure of a RCS (II) Example Date of change From- Unit To- Unit AreaPopula- tion Required extension: Change information

16. Basic structure of a RCS (II) Example

17. Products of the RCS (I) Status Table Conc-Moda*) Table [EU required] Correspondence Table *) Conc-Moda: ………………….

18. Products of the RCS (II) Status Table

19. Products of the RCS (III) Conc-Moda Table

20. Products of the RCS (IV) Conc-Moda Table

21. Products of the RC (V) Correspondence Table

22. Recalculation of values

23. Summary The influence of regional changes is significant to statistical values (time series) Retrograde data should be adjusted to provide comparable data Provisions on data and methods Regional Classification Server Force all producers to use the RC-Server

24. Changing regional classifications Acknowledgements: TURKSTAT (National Statistical Office of Turkey) Ms. MelikeYildirim Head of Department Publication and Data Dissemination USST-Project ( U pgrading the S tatistical S ystem of T urkey; EU-Aid Project) Mr. Ullrich Eichler Head of the Project Implementation Team

25. Thank You Dr. Udo Maack, Berlin, Germany eMail: geoconsultant@udo-maack.eu Phone: +49 177 405 33 52 Changing regional classifications ?