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The indicators and subindixes of the eu-index have been statistically calculated with aid of the Principal Component Analysis (PCA). The certain weightings can be found here: Weightings.

The exact procedure for calculating the weighting is described in:

König, J. und Ohr, R. (2013). Different Efforts in European Economic Integration: Implications of the EU Index. Journal of Common Market Studies, Vol.51(6), 1074-1090. doi: 10.1111/jcms.12058.

and in detail in:

König, J. und Ohr, R. (2012). Messung ökonomischer Integration in der Europäischen Union – Entwicklung eines EU-Integrationsindexes. cege-Diskussionspapier 135.

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