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.
Technically though a bull market is a rise in value of the market of at least 20%. The huge rise of the Dow and NASDAQ during the tech boom is a good example of a bull market. A Bear Market. A bear market is the opposite to a bull. If the markets fall by more than 20% then we have entered a bear market. A bear market is a market showing a lack of confidence. Prices hover at the same price then go down, indices fall too and volumes are stagnant.