This is a good book. after reading this book, i can calculate cox likelihood by hand(but i forgot now). Honestly, this book is for non-statisticians.----sort of verbose. if you know survival analysis, you can read it in one day. On the other hand, you may need more to do a real survival analysis. The author also has a book about some advanced topics in survival analysis, for example, counting process, etc. Recommend reading that book as well. jingju