Abstract
This study contributes to the debate on the development of aggregate metrics of societal progress. Summarising societal progress into a single number poses various methodological challenges, including the choice of indicators, normalisation, weighting and aggregation. This paper addresses the issue of aggregation in the case of metrics of well-being and uses as a case study the European Union regional Social Progress Index—EU-SPI—published by the European Commission. The index is an aggregate measure of 55 social and environmental indicators observed for all the European regions grouped into 12 components. In metrics of this type, while complete substitutability among components is rarely acceptable, controlling their level of substitutability is highly desirable. To this aim, we adopt a modified version of the unbalance penalisation approach originally proposed by Casadio Tarabusi and Guarini (Soc Indic Res 112:9–45, 2013). A penalisation is applied to the regions whose performance across the index components is unbalanced, that is when they perform well on some components but worse on others. The penalisation applied by this approach depends on two parameters that, in its original formulation, are generally arbitrarily chosen. We design a data-driven approach allowing for an informed choice of the penalisation parameters. The comparison between the EU-SPI original and penalised scores shows that the penalisation effect is particularly evident for regions with a strongly unbalanced profile across the components. The proposed method allows for adjusting the level of substitutability between components when constructing an aggregate metric, an important functionality especially when measuring societal progress for policy-making.
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Data are available at https://ec.europa.eu/regional_policy/en/information/maps/social_progress2020/.
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Code is available upon request.
Notes
These measures include components that could be valued in monetary terms and, for this reason, are here called “money-denominated”.
The geographical level of the indicators included in the EU-SPI is the NUTS2, defined as the level 2 of the Nomenclature of Units for Territorial Statistics, the hierarchical system defined by Eurostat for dividing up the territory of the EU.
In economics the case \(\left(1-\beta \right)<0\) is appropriate to be used in the aggregation function I when combining complementary good rather than substitutes.
Arrow et al. (1961) analyse some properties of the elasticity of substitution to assess the extent to which, in economics theory, capital and labour are substitutable for each other.
In case of a negative oriented index instead the penalty will be an increase and this property results in quasi-convexity: \(I\left( {\lambda x + (1 - \lambda )x^{\prime}} \right) \le max\left( {I(x),I(x^{\prime})} \right)\,for\,0 < \lambda < 1\).
The EU-SPI uses the min–max normalisation.
The values 0.5 and 1 were also tested for \(\alpha\). They were discarded because led to component and dimension iso-curves either too linear (\(\alpha\) = 0.5) or too sharp-cornered (\(\alpha =1)\). Results are not shown for sake of brevity.
We focus on scores and not on rankings because rankings are mutually dependent.
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Acknowledgements
Authors are grateful to Prof. Giovanna Boccuzzo, Director of the Department of Statistics of the University of Padua (Italy), for her comments on an earlier version of the paper.
Funding
This research is the outcome of a project partially funded by the Project of Excellence titled “Statistical methods and models for complex data” of the Department of Statistical Sciences, University of Padua that provided financial support to one of the authors during her stay at the European Commission headquarters in Brussels.
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Annoni, P., Scioni, M. The Unbalance Penalisation Method for Metrics of Social Progress. Soc Indic Res 162, 1093–1115 (2022). https://doi.org/10.1007/s11205-021-02876-4
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DOI: https://doi.org/10.1007/s11205-021-02876-4