Good morning for everybody, I would like to know: - what is the difference between estimate dynamic panel regressions data with and without the command “--dpdstyle”. - What means: matrix H according OX/DPD? in the context of estimation dynamic panel data regressions Thank you Carla. ___________________________________________ Carla Fernandes Professora Adjunta Universidade de Aveiro Instituto Superior de Contabilidade e Administração R. Associação Humanitária dos Bombeiros de Aveiro 3810-500 Aveiro Portugal Telefone: + 351 234 380 110 / Fax: + 351 234 380 111 e-mail: carla.fernandes(a)ua.pt