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 generally rising prices. The start of a bull market is marked by widespread pessimism. This point is when the crowd is the most bearish. The feeling of despondency changes to hope, optimism, and eventually euphoria, as the bull runs its course.