1. Developing a metadata system for microdata About the project of developing a system for description of microdata at Statistics Sweden

2. Agenda Background/Goals About the project Requirements Content The application Future work

3. Geographical Database Real Estate Price Register Renovation Register New Construction Register One or Two Dwelling Buildings Multi-Dwelling Buildings Industrial Real Estate Agricultural Real Estate Valued Estate Units Vision: The register system Swedish for Immigrants Adult Education Upper Secondary School 9th Form Register Teacher Register Higher Education Register Persons Enrolled in Education Education-Labour Market Register Income Statements Private Sector Employees, wages County Council Employees, wages Parish Employees, wages Local Authority Employees, wages Civil Service, wages Occupational Register Population Register of Jobs and Activities Real Estate Register Business Register Causes of Death Register Supplementary Benefits Register Vehicles – privately owned Register of Criminal Convictions Education RegisterEmployment Register Population and Housing Census Personal Income and Assets Persons Nominated and Elected Longitudinal Income Register (Linda) Longitudinal Register (Louise) Multi-Generation Register Fertility Register Business Income Demography of Enterprises Payrolls, number of employees Standardised Accounts Monthly Tax Returns Manufacturing VAT Register Foreign Trade Register Vehicles – company owned Agricultural Enterprises Register Register of Schools

4. The present Metadata system

5. Goals Replace the current Metadok system Improved documentation tool Provide an overview of our data material The system should contain information for improving comparability

6. Goals Be a part of a coordinated metadata system Harmonisation tool Tool for maintaining, standardising and making integration registers (matching) No actual content standardisation

7. About the project “Variable database project“ Started 1 January, 2004 Summing up from earlier projects Project group; Research and Development dept and publishing dept Version 1, for documenting 1 January 2007 Now – developing the system

8. Project organisation Three types of user groups Statisticians Methodologists System analysis's Reference group Steering committee Close cooperation with the Register unit

9. Make documentation easier Use metadata that already exist Classifications and standards Other documentations Search the metadata repository Document once - reuse

10. Examples of use New enquiries Analyse if the enquiry can be solved with already existing data. Integration registers

11. Examples of use (cont’d) Construction of sample frames Sample design Estimation Editing Time series

12. Examples of use (cont’d) Modelling data bases Information on where data are physically stored

13. Harmonisation Standard variables, object classes, classifications Structuring of registers Value domains Variables Other attributes

14. Contents, metadata about Variables Object classes and populations Value domains (classifications) Register

15. The model Object class Value domain Context Population Variable Population Context variable Object variable Register Version Register Variant Conceptual Value domain Value

16. Structure Register 123 –Register variant A Register version 1 –Content Populations (objects) Variables Value domains –Technical information –Sources

17. Linked information Object types, Variables, Value domains Owner, organisation Different types of document- ation Server, data- base, datatype

18. Links to other systems Links to: Archiving system Data act requests Product database Dissemination database

19. The future Metadata system VHS Product Database

26. Future work Develop the application Migration Level of ambition Content structure Maintenance and support organisation, including content

27. Summary Harmonisation tool Examples of content: population, object class, variables and value domains Examples of use: search, document and standardise