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 financial market of a group of securities in which prices are rising or are expected to rise. Bull markets are characterized by optimism, overall investor confidence and expectations that strong results should continue from securities ranging from bonds to stock.