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.
Bullish market is the opposite of bearish and refers to an upward trend in the stock market. One of the first rules of trading that most investors learn is buy when it's low, and sell when it's high. However, stock trading is a lot more complicated than that.