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.
An investor who believes a stock or the overall market will decline. A bear market is a prolonged period of falling stock prices, usually by 20% or more. Related: bull. An investor who believes, for any technical or fundamental reason, that a security or the broader market will decline significantly.