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…

Bob Geldorf (and who the hell is he?) was off by seventeen years. But then I read he's a singer and no professional climatologist. Since he's some big hoo-hah celebrity,…

Welcome Der Spiegel readers. See also this post. The computer revolution has been as bloody, wrenching, and disruptive as any other conflict. But unlike in territorial wars where there are…

This originally ran four years ago on 21 September 2009. One or two minor details have been changed to make the post current. Update: I see I screwed up the…

This is all made up data, so as not to hurt anybody's feelings. Also, this is a sketch. Everything can't be done in 700 words. We are interested in the…

"An Engineer" is a gentleman who has practiced Civil, Mechanical and Industrial Engineering for more than 40 years. He has been granted patents for a number of practical inventions, and…

Introduction Marchmain Pharmaceuticals distributes profitizol, said to cure the screaming willies. To assess that claim, Marchmain assembled volunteers suffering this dread malady. Each provided his address, which was used to…