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.
(October 2008). A grey market (sometimes called a parallel import, but this can also mean other things; not to be confused with a black market or a grey economy) is the trade of a commodity through distribution channels which are legal but are unofficial, unauthorized, or unintended by the original manufacturer.