roberto zelli university of rome "la sapienza"   università di roma "la sapienza" dip. cnaps - faculty of statistics - box83 roma62 p.le aldo moro 5 rome, 00185 italy   roberto.zelli@uniroma1.it     Biographical Sketch: 1996-to date: Senior Lecturer of Statistics and Economics, Department of National Accounts, University of Rome "La Sapienza". 1993-1996: Ph.D. in Economics, Department of Economics, University of Rome "La Sapienza". Thesis on "Persistence effects in economic time series: a disaggregated analysis of Italian output". 1992-1993: M.Sc. in Quantitative Development Economics, Department of Economics, University of Warwick, UK. 1985-1990:Degree in Statistics and Economics, First Class (hons). Faculty of Statistics, University of Rome "La Sapienza".   Primary Research Focus: income distribution and growth; poverty; business cycle;   JEL Areas: C0 : Mathematical and Quantitative Methods: General I3 : Welfare and Poverty: General