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.
The black market is not a physical place, but rather an economic activity in which merchandise and/or services are bought and sold illegally. Also called the âunderground market,â this market gets its name due to the fact that its activity is conducted out of sight and often âin the dark,â outside the sight of law enforcement.