Methodology

EU-SILC is based on the idea of a common framework. The common framework is flexible in terms of data sources and sampling design although the use of existing data sources, whether they are surveys or registers, and the use of national sampling design is strongly encouraged.

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As an illustration, the following sampling designs were used in 2007:

  • Sampling of dwellings or addresses: Czechia, Germany, Spain, France, Hungary, Latvia, Luxembourg, Malta, the Netherlands, Austria, Poland, Portugal, Romania and United Kingdom.
  • Sampling of households: Belgium, Bulgaria, Cyprus, Greece, Ireland, Italy, Slovakia and Switzerland.
  • Sampling of individuals: Denmark, Estonia, Lithuania, Slovenia, Sweden, Finland, Iceland and Norway (all ‘register' countries except Lithuania).

The common framework defines a number of target objectives aimed at maximising the comparability of the information produced:

  • Concepts and definitions;
  • Guidelines and procedures;
  • Harmonised lists of variables;
  • Classifications.

List of variables

EU-SILC comprises a list of target variables which are based on common guidelines. Each country may implement the most efficient solution from a national perspective to deliver the data corresponding to each variable. (For more details see Questionnaires under 'Quality') There are two kinds of variables in EU-SILC: the primary and secondary variables.

 

Primary variables

The primary variables are collected every year. These variables refer either to household or to individual (for person aged 16 and more) information and are regrouped into domains:

  • At household level, four domains are covered: (1) basic data, (2) housing, (3) material deprivation and (4) income.
  • The personal level is regrouped into five domains: (1) basic/demographic data, (2) education, (3) health, (4) labour and (5) income.

  Household register (list)

  Household data (list)

  Basic data

  Housing

  Material deprivation

  Income

  Personal register (list)

 

  Basic data

  Child care

  Personal data (list)

  Basic data

  Education

  Health

  Labour

  Income

Secondary variables

Supplementary variables on Material Deprivation

It is a pilot data collection, based on ESS agreement (for further details on ESS agreement see "Legislation"), of supplementary compulsory and optional variables on material deprivation implemented in 2013.

2013: Material deprivation 

Classifications

The classifications used in the production of EU-SILC results are based on international systems.

  • The country codes conform to the ISO 3166 (International Organisation of Standardisation), with the exception of the United Kingdom which is coded as UK.
  • The regional codes are the NUTS II and the corresponding statistical regions for the EFTA and Candidate Countries.
  • The education variables (the level currently attended and the level reached) are based on ISCED 2011.
  • The classification of occupation uses ISCO-88 (Com).
  • The classification of economic activity uses NACE (Rev. 1.1 until 2007, Rev. 2 from 2008 onwards). See details on the transition between NACE Rev. 1.1 and Rev. 2.

For more details on the classification used please see RAMON, Eurostat's metadata server.