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.
Rally (stock market) A rally is a period of sustained increases in the prices of stocks, bonds or indexes. This type of price movement can happen during either a bull or a bear market, when it is known as either a bull market rally or a bear market rally, respectively. However, a rally will generally follow a period of flat or declining prices.