The Oxford Handbook of Panel Data examines new developments in theory and applications in panel data. It includes basic topics like nonstationary panels, co-integration in panels, multifactor panel models, panel unit roots, measurement error in panels, incidental parameters and dynamic panels, spatial panels, nonparametric panel data, random coefficients, treatment effects, sample selection, count panel data, limited dependent variable panel models, unbalanced panel models with interactive effects, and influential observations in panel data. The second part targets applications of panel data in economics, including health, labor, marketing, trade, productivity, and macro applications in panels.