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

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

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

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

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

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

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

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

Preliminary results Q1 2010

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

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

Thank you! Paris, February 2010 Sammy Lauritsen