Quantile regression and structural change in the Italian wage equation |
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| Affiliation: | 1. Universidad Rey Juan Carlos. Facultad de Ciencias Jurídicas y Sociales. Campus de Vicalvaro. Paseo de los Artilleros s/n 28032 Madrid, Spain;2. European Commission Joint Research Centre, Via Fermi 2749, I-21027, Ispra (VA), Italy and Vilnius University;3. Pontifical University of Salamanca, Henry Collet 90-98, Salamanca, Spain;1. LEE & Economics Dept., University Jaume I, 12071 Castellón, Spain;2. School of Agriculture Policy and Development, University of Reading, UK and LEE & Economics Dept., University Jaume I, Castellón, Spain;3. Political Science Dept., University of Crete and Institute of Applied & Computational Mathematics, Foundation for Research and Technology Hellas and Dusseldorf Institute for Competition Economics, University of Dusseldorf, Germany;4. Economics and Finance Subject Group, Portsmouth Business School, University of Portsmouth, Richmond Building, Portland Street, Portsmouth, Hampshire PO1 3DE, UK;5. Economics Dept., University of Crete, Greece;1. University & Polytechnic Hospital La Fe, Valencia, Spain;2. Neonatal Research Unit, Health Research Institute La Fe, Valencia, Spain;3. Department of Paediatrics, Royal Hobart Hospital and University of Tasmania, Hobart, Tasmania, Australia;4. Menzies Research Institute Tasmania, Hobart, Tasmania, Australia |
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| Abstract: | A test for structural break based on quantile regressions (QR) reveals the impact of a break in the tails of the conditional distribution, unveiling an opposite behavior in the tails that balances at the mean and that cannot be found using OLS. By repeatedly computing the QR test it is possible to check for stability of the coefficients both over time and with respect to dichotomies in the explanatory variables, such as generations or regions. This provides evidence of a break in earnings i) over time, with wages decreasing in the latest period; ii) across generations, where young workers experience a decrease in returns to education; and iii) across regions, with an opposite pattern of earnings, unstable at the lower quantiles in the southern regions and unstable at the higher wages in the north-center area. |
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