Business enterprises -- Colombia -- Bogotá -- Econometric models 1 Day care centers -- Economic aspects -- Argentina 1 Daylight saving -- Argentina -- Econometric models 1 Economic development -- Effect of education on -- Econometric models 1 Educación y Estado -- Misuri 1 Education -- Economic aspects -- Econometric models 1 Education and state -- Missouri 1 Education, Preschool -- Economic aspects -- Argentina 1 Empresas comerciales -- Colombia -- Bogotá -- Modelos econométricos 1 Energy conservation -- Argentina -- Econometric models 1 Estados Unidos. -- No Child Left Behind Act of 2001 1 Human capital -- Econometric models 1 Income distribution -- Mathematical models 1 Income maintenance programs -- Mathematical models 1 Informal sector (Economics) -- Colombia -- Bogotá -- Econometric models 1 Maestros -- Formación profesional -- Misuri 1 Mothers -- Employment -- Argentina 1 Poverty -- Mathematical models 1 Sector informal (Economía) -- Colombia -- Bogotá -- Modelos econométricos 1 Teachers -- Training of -- Missouri 1 United States. -- No Child Left Behind Act of 2001 1