Survivor Bias on the Gridiron
The concept of survivor bias, if you don’t know it, is well worth being aware of. It’s most often used in finance, where it refers to a “tendency for failed companies to be excluded from performance studies” (thanks, Wikipedia). Think of the Dow Jones Industrial Average, which indexes the stock prices of 30 of the largest and most important U.S. companies – until, that is, one of said companies does so poorly that it is booted from the index and is replaced by a company that’s doing better.