I. When the sum of the residuals is greater than zero, the data set is nonlinear. II. A random pattern of residuals supports a linear model. III. A random pattern of residuals supports a non-linear model.
bull market definition. A market, especially a stock market, characterized by rising prices; the opposite of a bear market. We can always go back to worrying; we are still in a bull market for fear.
Gray market is a slang term used to describe distributors who sell equipment or product without having obtained authorization from the manufacturer to do so. The term is used to describe unauthorized DVD, CD, software or computer hardware sales.