Abstract
This paper investigates the role of economic variables in predicting regional disparities in reported life satisfaction of European Union (EU) citizens. European subnational units (regions) are defined according to the first-level EU nomenclature of territorial units. We use multilevel modeling to explicitly account for the hierarchical nature of our data, respondents within regions and countries, and for understanding patterns of variation within and between regions. Main findings are that personal income matters more in poor regions than in rich regions, a pattern that still holds for regions within the same country. Being unemployed is negatively associated with life satisfaction even after controlled for income variation. Living in high unemployment regions does not alleviate the unhappiness of being out of work. After controlling for individual characteristics and modeling interactions, regional differences in life satisfaction still remain, confirming that regional dimension is relevant for life satisfaction.
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Notes
A notable exception is the recent analysis of regional well-being in Europe by using European Social Survey data of Aslam and Corrado (2007).
Because of data deficiencies, Sweden and Finland are considered as whole countries and the French Départements D’Outre-Mer are excluded.
These findings are in accordance to the ones obtained by Scoppa and Ponzo (2008) who used data on Italians subjective well-being from the Bank of Italy Survey of Household Income and Wealth.
Estimates of the models are obtained by the lmer function in R (R Development Core Team 2006) and are based on the restricted maximum likelihood procedure (REML). The REML procedure corrects the downwards bias of the maximum likelihood estimator of variance components related to the lost of degrees of freedom in estimating the fixed effects. The name lmer stands for linear mixed effects in R but the function works also for generalized linear models. However some technical challenges exist in fitting multinomial models in a multilevel framework. Therefore, for the ordered logit model we use the classical no-pooling regression. The term “mixed effects” refers to random effects (coefficients that vary by group) and fixed effects (coefficient that do not vary) (Gelman and Hill 2007).
As pointed out by, e.g., Di Tella et al. (2003) and Frey and Stutzer (2006), estimated effects should be treated with caution since some personal characteristics can be considered endogenous. Moreover if unobserved personal traits influence reported life satisfaction, results suffer from potential bias.
Due to data availability in the European regional data set we use in models with more complex multilevel structure, we report for coherence the results of the fitting for the period 1997–2002. However, we did not find any significant difference when we use the Eurobarometer data expanding the period backward to 1992. Detailed results of the fitted models are available upon request from the authors.
Income is treated as a continuous variable and centered to reduce the correlation between group-level intercepts and slopes. We allow the coefficients of each employment category to vary. In line with our goal, results are focused only on the unemployment status.
We implemented the weighted local polynomial regression (LOWESS, LOcally WEighted Scatterplot Smoother), as proposed by Cleveland (1979). As Cleveland discusses, rather than calculating one regression line for an entire dataset, one calculates regression estimates for overlapping sets of x values. To find smoothed values, the procedure fits n polynomial regressions to the data, one for each observation j, including the points with x-values that are near x j . We implemented this model in R by choosing an appropriate smoothing span that gives the proportion of points in the plot which influence the amount of smoothing at each value. The choice of the LOWESS procedure among other possible approaches of “smoothing” relies on its robustness to the presence of outliers.
Adding per capita GDP in the model for the whole period (1997–2002) is problematic as a potentially non stationary predictor (the GDP) is introduced to explain an outcome that is naturally stationary (the life satisfaction rated on a four-point scale). Therefore, the estimated coefficients may be “unpersuasive” due to the inapplicability of conventional statistical procedures (Di Tella et al. 2003). The (stochastic) trend of the non stationary variable will in fact dominate all other variations. To overcome this problem we prefer to model the time-series structure of our dataset repeating the model year-by-year. The method of repeated modeling, followed by time-series plots of estimates is rarely used as a data analytic tool but it can be very informative and easy to understand.
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Acknowledgments
The authors thank the Columbia University, Applied Statistics Center, and the National Science Foundation and National Institutes of Health for financial support. They also acknowledge Sapienza, University of Rome, for financial assistance under grant number C26F07R754. They would like to thank an anonymous reviewer and participants of the XXX IARIW conference, Portoroz, Slovenia, August 2008, for their precious comments and suggestions.
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Pittau, M.G., Zelli, R. & Gelman, A. Economic Disparities and Life Satisfaction in European Regions. Soc Indic Res 96, 339–361 (2010). https://doi.org/10.1007/s11205-009-9481-2
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DOI: https://doi.org/10.1007/s11205-009-9481-2