The Devil Is in the Detail: Measuring Intra-EU Labour Migration 53 Figure 3.3: The percentage point change in Western European labour migration as a percentage of the labour force, from 2005-2016 Source: own elaboration based on EU-LFS data Note: countries displayed in a colour not included in the legend indicate no data available In comparison with the OECD, the EU-LFS provides a lower estimation for the foreign-born population. This could be because migrant populations are hard to reach and are consequently underrepresented, although the weights provided in the survey should adjust for this. Certain countries such as Austria, Switzerland, and the United Kingdom, have EU-LFS estimations of their foreign-born population that are very close to the OECD’s official statistics. In other countries the gap in the statistics noted in the year 2004 data rapidly closed by 2013. It is possible that sampling methods for the EU-LFS in these countries are more effective than in other countries and that for some countries sampling methods have improved over time. For example, in 2008 several countries (Czech Republic, Denmark, Estonia, Greece, Norway, Poland, Slovenia and United Kingdom) changed their methods, data sources and definitions in order to improve and harmonise data on migration flows.
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