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.
Grey Market. What is the 'Grey Market'. The grey market, also referred to as the parallel market, is a market where a product is bought and sold outside of the manufacturer's authorized trading channels. The grey market is where the unofficial trading of a company's shares, usually before they are issued in an initial public offering (IPO), happens.