Nearly a decade has passed since the publication of the first edition. Many instructors have used the first edition to teach master's and . students. Based on their feedback and our own teaching experience, it became clear that we needed to revise the book to make it more accessible to a larger audience, including upper-level undergraduates. To this end, we have expanded and reorganized the early chapters in the second edition. For example, our book now provides a self-contained presentation of regression analysis (Sections ), which prepares those students who have not previously taken a regression course. We have found that such a foundation is needed because most.
