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.
Bull vs. Bear Markets. The opposite of a bull market is a bear market, which is characterized by falling prices and typically shrouded in pessimism. The use of bull and bear to describe markets comes from the way the animals attack their opponents.