How happy are you? On a scale between one and ten, of course. Nobody could be eleven-happy. Listen: I can't measure your happiness unless I put a number to it.…

The rumor went around that trains were throwing steel ball bearings from their wheels. Genuine steelies! Somebody said they saw one that a kid from Detroit brought up. So big…

This is the start of a series of reference articles which explain analytical techniques, with a focus on the philosophy, understanding, common mistakes, and not mathematics. Overview Regression, a.k.a. "linear…