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.
Investors have perceptions and expectations about the securities markets and whether or not the value of specific securities, as well as the market overall, will rise or fall. The bull (or bullish investor) makes investments based on his or her belief that the market will climb higher or that certain securities will post gains. The opposite is the bear (or bearish investor), who acts upon his or her belief that the market will decline in value or that certain securities will decline in value.