The book covers topics including regression models, parameter estimation techniques, properties of the estimators, statistical testing and model specification problems in detail. Elementary concepts of statistics have been provided in Chapter 1 of the book. For ease of understanding, chapters on advanced topics are covered in the later part of the book. Statistical and mathematical derivations are used in the book in a thorough manner for the students and researchers who do not have any exposure to the course Econometrics. Each chapter contains several examples and exercise problems illustrating the applications of econometric theories. Some of the examples and exercise problems have been taken from the UGC NET Examination, Examinations at several Universities and Competitive Examinations. Every effort has been made to explain the basic theories in a simple way for easy understanding of the subject. A discussion on Computer Packages STATA and R is given in the Appendix Section.