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.
A bull market is a period of several months or years during which asset prices consistently rise. The term is usually used in reference to the stock market, but it can describe specific sectors such as real estate, bonds or foreign exchange. It is the opposite of a bear market, in which securities prices consistently fall.