1. Internet data collection in the LFS Danish experiences Paris, April 2010

2. Outline Background Preparations The pilot Going full-scale Quality? Further work

3. Background 1 The Danish LFS has individuals as sampling unit Until 2010 household variables collected via proxy in final interview From Q1 2010 Denmark collects household variables as required by regulation no. 577/98

4. Background 2 Grant given from Eurostat in 2008 Initial work on differences between CATI- and CAWI-interviews

5. Preparations Discussions on collection modes: –How much CATI? –How many reminders? –Letter vs. phone reminders? Two parallel universes

6. The Pilot Two reference weeks as sample Two weeks interview period Two groups: Aldi vs. Irma –Aldi: baseline with no reminders –Irma: Two phone reminders and optional CATI

7. Pilot – the results What was learned: –Reminder needed –2nd reminder not necessary –CATI option needed Showed that a pilot was essential

8. Going full-scale Not a big problem Not possible to keep as separate universes – today one big survey.

9. Preliminary results Q1 2010

10. Quality Accepted a possibly lower quality. Primary issues: NACE, ISCO Further study needed Setup test vs. quality test

11. Further work In-depth quality analysis Coding of NACE and ISCO Analysing the mode effects of CAWI in core-LFS

12. Thank you! Paris, February 2010 Sammy Lauritsen ssl@dst.dkssl@dst.dk