My team references this book often when explaining why they formed a conclusion from data.  It's core to our business and this book outlines so comprehensively the methods of doing it right, identifying bias, and ensuring our conclusions are accurate.<br><br>This is not a how-to book.  It's not even a book on math, really.  This is the "why" behind working with data.  It is the definitive handbook on data that every data scientist, analyst, business manager should understand before working with data.<br><br>If you work with data - and just as importantly - if you rely on a team that works with data, this needs to be on your bookshelf.