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.
Bull Market. A bull market is loosely defined as a period when the stock market as a whole is rising in price. Certain sectors of the economy may experience a bull market while other sectors remain stagnant or are in decline. The classic way of making money in stocks during a bull market is to purchase a security, wait for the stock price to go up, then sell. The difference between the purchase price and the sale price of the stock is referred to as a capital gain.