Panel data u Rotating panels: Spanish household survey Spanish income study http://www.cemfi.es/valbarran/0008r.pdf) Efficiency analysis: Efficiency measurement in rotating panel data,Heshmati, A, Applied conomics30,1998,pp.919930 o Hierarchical(nested )data sets: Student outcome, by year, district, school, teacherPanel Data  Rotating panels: Spanish household survey ◼ Spanish income study (http://www.cemfi.es/~albarran/0008r.pdf) ◼ Efficiency analysis: “Efficiency measurement in rotating panel data,” Heshmati, A, Applied Economics, 30, 1998, pp. 919-930  Hierarchical (nested) data sets: Student outcome, by year, district, school, teacher