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Validating integration and citizenship policy indices

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Comparative European Politics Aims and scope

Abstract

After a long period of mostly case study research, in the recent past various integration and citizenship policy scholars have started to compare a relatively large range of countries by constructing policy indices. As there are almost as many indices as there are such studies, one might wonder whether it matters which indices we use. The main goal of this article is to compare these indices and to investigate commonalities and differences. By means of content, convergent and construct validity tests, methodological strengths and weaknesses will be discussed. It will be shown that most of the indices consist of different components and are sometimes weakly related to each other even if they can be explained by similar factors. An overview of the current state of research in this field allows us to learn from the innovative ideas that have been developed so far and to discuss the next steps to be taken.

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Notes

  1. A similar development has taken place in the immigration literature (see Helbling et al, 2013 and Bjerre et al, 2013). However, this article focuses on integration and citizenship policy indices as the data sets on immigration policies are not accessible and because most researchers in this field have only investigated sub-policy fields such as asylum or labor migration (for example, Thielemann, 2003; Hatton, 2004; Cerna, 2008; Ruhs, 2011; see, however, Givens and Luedtke, 2005 as well as Klugman and Pereira, 2009).

  2. By ‘index’ I understand a measurement that operationalizes in a quantitative way a social phenomenon and represents an aggregate of data. By ‘indicator’, ‘item’ or ‘variable’ I mean the most basic element of an indicator.

  3. In the remainder of this article, I use the abbreviations as they are used by the authors. If there is no abbreviation for an index I simply refer to its author. I mostly discuss indices that allow comparisons at the country level. In Switzerland, indices have been created for the subnational level that will be discussed at the margins of this article (Helbling, 2008; Manatschal, 2012; see also Manatschal and Stadelmann-Steffen 2013).

  4. Bollen (1989) also discusses criterion validity that involves the comparison of an index with some other generally accepted measure of the same concept. If there was already an index that was accepted by the research community as the most valid measurement, the validity of new indices could simply be assessed by comparing them. However, since researchers have just started to measure integration and citizenship policies, it is not surprising that there is so far no such generally accepted index. It appears that it becomes almost impossible to assess the criterion validity of the existing indices and that such tests need to be precluded at the current stage of research.

  5. As a consequence the number of data points (N) that can be compared varies a lot depending on which indices are analysed.

  6. More detailed analyses with scatter plots have, however, shown that the results are not driven by outliers.

  7. I have retained the naturalization subindices as conceptualized and measured by the authors: For the ICRI data I retained the ‘nationality acquisition’ subindex, for the LOI data the ‘naturalization’ subindex and for MIPEX the ‘access to nationality’ subindex.

  8. As the EUDO CITIZENSHIP Observatory has not constructed an index so far we cannot include the CITLAW indicators in these analyses.

  9. The LOI indices are excluded from these analyses as Waldrauch and Hofinger (1997) have not constructed an overall index. The same holds for the EUDO CITLAW Indicators. Jeffers et al (2012, p. 7) argue that their indicators cover more aspects than the other existing citizenship indices. According to them, aggregating all these different aspects would lead to an index that could not be interpreted in a straightforward way.

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Acknowledgements

I would like to thank Sara Goodman Wallace, Edward Koning, Ruud Koopmans, Enric Martinez-Herrera, Ines Michalowski, Didier Ruedin, Maarten Vink and the anonymous reviewers for their comments on previous versions of this article.

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Table A1

Table A1 Data access and time periods for comparison

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Helbling, M. Validating integration and citizenship policy indices. Comp Eur Polit 11, 555–576 (2013). https://doi.org/10.1057/cep.2013.11

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