Basicly, this textbook is too confined in the context of the software Arc. And I think this software isn't useful at all beyond the textbook. This textbook is not well-organized logically, and it doesn't state well the reasons of some methods and algorithms and how they come, and it has some concluson that are built upon nothing. Besides, it takes a lot of time and efforts to sort through the many useless words, sometime you just feel that the authors are just trying to increase the volume. There are some good methods, but the textbook state it in a way that after some time, you won't even think of what they are about. I think it should be more general, more reasonable, more well-organized and clearly-narrated.Anyway, it might be good for a beginner of regression.