This book is a very good start in Quantitative Methods. It is easy to read and the examples are so simple that even if you cannot concentrate to the words you can understand everything from the examples. It can give you only the fundamental knowledge of these methods but the examples are so extensive that is very easy to get deeper into the subject (with a more specialized book). There are some mistakes in the book, but they are so simple mistakes that finding them are a simple and good exercise. With these books I learned the "WHY" to things I already new. The writer must be a great teacher.