Econometric theory and methods Econometric Theory and Methods provides a unified treatment of modern econometric theory and practical econometric methods. The geometrical approach to least squares is emphasized as is the method of moments which is used to motivate a wide variety of estimators and tests. Simulation methods including the bootstrap are introduced early and used extensively. The book deals with a large number of modern topics. In addition to bootstrap and Monte Carlo tests these include sandwich covariance matrix estimators artificial regressions estimating functions and the generalized method of moments indirect inference and kernel estimation. Every chapter incorporates numerous exercises some theoretical some empirical and many involving simulation. Econometric Theory and Methods is designed for beginning graduate courses. The book is suitable for both one and two term courses at the Masters or Ph.D. level. It can also be used in a final year undergraduate course for students with sufficient backgrounds in mathematics and statistics. FEATURES BLUnified Approach: New concepts are linked to old ones whenever possible and the notation is consistent both within and across chapters wherever possible. BLGeometry of Ordinary Least Squares: Introduced in Chapter 2 this method provides students with valuable intuition and allows them to avoid a substantial amount of tedious algebra later in the text. BLModern Concepts Introduced Early: These include the bootstrap (Chapter 4) sandwich covariance matrices (Chapter 5) and artificial regressions (Chapter 6). BLInclusive Treatment of Mathematics: Mathematical and statistical concepts are introduced as they are needed rather than isolated in appendices or introductory chapters not linked to the main body of the text. BLAdvanced Topics: Among these are models for duration and count data estimating equations the method of simulated moments methods for unbalanced panel data a variety of unit root and cointegration tests conditional moment tests nonnested hypothesis tests kernel density regression and kernel regression. BLChapter Exercises: Every chapter offers numerous exercises all of which have been answered by the authors in the Instructors Manual. Particularly challenging exercises are starred and their solutions are available at the authors website providing a way for instructors and interested students to cover advanced material.