This course covers the econometric tools needed to understand empirical economic research and to plan and execute independent research projects. Estimation and testing of economic models will be an important part of the course.  This course begins with the linear model but considers extensions in several directions: (1) predetermined but not exogenous regressors; (2) heteroskedasticity and serial correlation; (3) classical GLS; (4) instrumental variables and generalized method of moments (GMM) estimators. Maximum likelihood  (ML) estimation and inference are discussed.