1. Survey Data Management and the Combined Use of DDI and SDMX Arofan Gregory Chris Nelson Metadata Technology Eurostat, June 4-6 2013

2. Overview Eurostat is currently working on an end-to-end example of how SDMX and DDI could be used together in the contenxt of the collection of the Labor Force Survey – Using DDI to describe a questionnaire (from ISTAT) – Describing the collected microdata and its processing using DDI – Mapping the tabulated DDI to SDMX – Reporting and disseminating the SDMX data

3. Overview (Cont.) For the survey questionnaire, we will look both at the LFS example, but also at work currently being done at INSEE using DDI The rest of the work-flow will be presented using slides and demos, both for DDI and for SDMX There is a direct mapping between SDMX and DDI, and this will also be presented

4. Describing the LFS Questionnaire with DDI

5. The Questionnaire We are using the questionnaire as developed by ISTAT for collecting national LFS data It has several modules, with complex flows based on respondent’s employment status

6. The ISTAT Questionnaire

7. Analysis of the Questionnaire The questionnaire has a number of elements: – Question text – Response domains – Statements – Flow logic – Interviewer instructions These can all be modelled in DDI

8. Questions and Response Domains DDI supports many types of response domains – Codes – Categories – Numeric – Textual – Date and time All of these are used in the LFS questionnaire

9. QuestionScheme QuestionItem CodeDomain CodeScheme CategoryScheme Code 1 Code 2 Code 3 Category “Yes” Category “No” Category “Maybe”

10. Flow Logic

11. DDI Flow Logic Description DDI uses a series of “control constructs” to model flow logic – Statements – Question References – Conditional logic (IfThenElse, loops, sequences, etc.) – References to Interviewer instructions The Questions and Interviewer instructions are held separately, in Schemes

12. The Instrument The Instrument (in DDI) represents the actual questionnaire It references the top-level sequence of the flow logic

13. DDI Packaging Elements

14. INSEE Use Case