1. ESSnet DataWareHousing Stocktaking Pieter Vlag, Viviana di Giorgi, Sonia Queresma

2. ESSnet DataWareHousing - questionnaire 1 Questionnaire Starting Point Data model perspective Proces model perspective Meta data very important Position of Business Register in system ?? Needs of other NSIs

3. ESSnet DataWareHousing: questionnaire 2 Data model perspective MAIN MOTIVATION: FLEXIBLE + CONSISTENT OUTPUT

4. ESSnet DataWareHousing Questionnaire 3 Process model perspective MAIN MOTIVATION: EFFICIENCY IN PROCESS

5. ESSnet DataWareHousing Questionnaire 4 Questionaire 21.3.2011: - 21 responses (one per country considered); non-respons homogeneously distributed over Europe - Many countries mention that “DWH” work is in progress or their system is partially implemented - Inconsistencies in the answers, possibly related due to current vs. future situation different perception of used terminology -Most countries sent in a ‘common view’, but….. In case of >1 answer per country: answers on questions might differ

6. ESSnet DataWareHousing Questionnaire 5 Questionaire - Good news

7. ESSnet DataWareHousing Questionnaire 6 Motivations for DWH CONCLUSION: - data-integration,datalinking and efficiency are main motivations

8. ESSnet DataWareHousing Questionnaire 7 Questionnaire on perspectives This suggests: - “Data model: ~ 9 countries - “ Process model” ~ 6 countries - “ mix of approaches” ~ 6 countries

9. ESSnet DataWareHousing Questionnaire 8 Questionnaire: answers on perspectives II Two remarks: 1.“ Process model” : 6 countries > one-to-one correspondences : 4 countries 2.if main characteristic of “data model perspectives” = flexibility in output, then most countries (17) have some “data model perspectives”in their system

10. ESSnet DataWareHousing Questionnaire 9 Questionnaire: answers on perspectives II GENERAL IMPRESSION: preferred situation= data model perspective In practice most countries start with a process data approach (and expand it at a later stage) -> “data model” / “process model” perspective description do NOT discriminate between the practices

11. ESSnet DataWareHousing Questionnaire 10 Questionnaire: terminology “data model” & “process model” perspectives were introduced two express that two main motivations may lead to starting a DWH - process efficiency - more flexible + consistent out put However, -questionnaire does not reveal a clear dinstinction between these motivations - models are not exclusive - in practice a mix is used (maybe related to “live phase” of the DWH Proposal: use “data model perspective as ideal situation ?

12. ESSnet DataWareHousing Questionnaire 11 Meta data Conclusion: Meta data are considered as important, but are not always integrated in the systems (yet ?) Question: Which metadata to be used in DWH ?

13. ESSnet DataWareHousing Questionnaire 12 Conceptual differences II Apparently differences in approaches

14. ESSnet DataWareHousing Questionnaire 13 Conceptual differences: active versus passive surveys Admin data census Cleaned input Processed data I Processed data II Processed data III Output data Aggregate data micro data Time series Active DWH: processing and storage NOT separated Active DWH: proccessing steps between storage Business register – not integral part

15. ESSnet DataWareHousing Questionnaire 14 Conceptual differences III DWH model/system Active (10) Passive (11) Business Reg. integral part (5) Business Reg. not integral part (5) Business Reg. integral part (5) Business Reg. not integral part (6) No relationship between (considered) active/passive datawarehouse and position of business register (in answers on questionnaire)

16. ESSnet DataWareHousing Questionnaire 15 Conceptual differences CONCLUSION: - implicitly, doubts about business case ?????? - output side: different statistical requirements are considered as complex

17. ESSnet DataWareHousing Questionnaire 16 Conclusions Flexibility in output; data linking and efficiency in process are the main motivations for DWH ? “data model” and “process model” descriptions were helpful for the questionnaire, but should be used differenly in future. Meta data are – indeed – considered as important, and an interesting topic for this ESSnet to work out Two opinions about DWH: - active vs. passive - position of business register both are not linked to each other: but interesting topics for ESSnet to work out Different statistical requirements (=output ?) are considered as complicated and a possibly interesting topic for this ESSnet to work out Data confidentiality hardly mentioned

18. ESSnet DataWareHousing Questionnaire 17 Continuation (advice) Visit countries to obtain the details. Focuss on: - Meta data - active vs. passive - position of business register - different statistical requirements From SGA-2011provide requirements about these topics.