Abstract
With data from the Italian Survey of Household Income and Wealth, we present an Index of Household Financial Condition and quantify with it the position of households between 2004 and 2010. The Index of Household Financial Condition is composed of subjective and objective indicators, which enable to capture differently the existing uncertainty concerning the future development of a household’s financial situation. We show with a measurement model based on multi-group confirmatory factor analysis (MGCFA) that the proposed Index is two-dimensional and comprises financial position and financial prudence. Through application of the MGCFA, we show that the interrelations between the indicators had not changed at four measurement occasions (2004–2010), and thus the proposed set comprises a coherent and time-invariant framework for measuring two dimensions of the latent concept: financial condition. Established measurement invariance in the MGCFA framework allows an assessment of trend in financial position and financial prudence of Italian households. We show that the financial position of Italian households improved in the period 2004–2006 and later declined. Improvement of the financial prudence was observed, however, till 2008. Finally, we incorporate a set of socioeconomic features of Italian households into a structural equation model. With the provided set of indicators, we find positive relation between age and both financial position and prudence, but also we show the positive impact of white-collar jobs on scores in each of the dimensions of the financial condition.
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Notes
Bank of Italy, Survey on Household Income and Wealth. http://www.eui.eu/Research/Library/ResearchGuides/Economics/Statistics/DataPortal/SHIW.aspx; http://www.bancaditalia.it/statistiche/indcamp/bilfait.
Bank of Italy, Survey on Household Income and Wealth.
It must be noted that the interviews for the sample survey in 2004 were conducted between February and July 2005, the interviews for the sample survey in 2006 were conducted between March and October 2007, the interviews of the sample survey in 2008 were conducted between January and September 2009 and the interviews of the sample survey in 2010 were conducted between January and September 2011.
Taking the logarithm of both income and wealth is motivated both theoretically and pragmatically. From a theoretical perspective, in life-cycle models, it is common to model the utility of households using a constant relative risk aversion type of function and present empirical implications with one of its representatives—the logarithmic function (for some recent applications see e.g. Carroll and Toche 2009; Onori 2012; Zhang 2012). On this basis, utility becomes proportional to the logarithm of consumption (income) (Osberg 1991). The same logic applies to wealth. From a pragmatic perspective, the variances of non-transformed income and wealth are very high and their distributions are highly skewed. The distributions of income and wealth often resemble log-normal distributions, which further justifies the logarithmic transformation. Strong support for logarithmic transformation of incomes is also provided by Kahneman and Deaton (Kahneman and Deaton 2010) who claim that “The logarithmic transformation represents a basic fact of perception known as Weber’s Law, which applies generally to quantitative dimensions of perception and judgment (e.g., the intensity of sounds and lights)”. The procedure of log-transformation is also required to linearize income and wealth (Bostic et al. 2009).
The sample includes households reporting negative incomes (about 0.01–0.05 % of households per wave) and/or wealth (2.30–2.93 % of households per wave). Although it is not always clear what a negative income implies and whether it is connected with change in the value of household assets we assumed that it corresponds to real though very bad economic situation of a household. The same reasoning applied to negative wealth. Second, in order to apply logarithmic transformation, negative incomes and negative wealth need to be treated but they cannot be simply excluded from the sample. Therefore, the following outlier treatment method is used. Each of the negative values of income or wealth is replaced with value 1. The same approach was employed by Huber et al. (2002) and Osborne (2010), among others. Furthermore Osborne (2010) showed that it is the most efficient among all Box-Cox transformations. Then the logarithmic transformation of each of the two variables is conducted. The transformed income data are used to calculate four ratio indicators (inc_suff, c_total, c_food, sav).
Exactly the same method is adopted in Saisana (2010). Frigge et al. (1989) provide substantial arguments for using 1.5 as the multiplier for the interquartile range, while application of winsorization as a tool for dealing with outliers in constructing indices can be found for example in Environmental Performance Index prepared jointly by Yale University and Columbia University (Esty et al. 2008).
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Bialowolski, P., Weziak-Bialowolska, D. The Index of Household Financial Condition, Combining Subjective and Objective Indicators: An Appraisal of Italian Households. Soc Indic Res 118, 365–385 (2014). https://doi.org/10.1007/s11205-013-0401-0
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DOI: https://doi.org/10.1007/s11205-013-0401-0