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.
1 The terms bullish and bearish are used to describe stock market trends. 2  A bearish market refers to a downward trend in the stock market which is characterized by falling share prices coupled with widespread pessimism as investors go on a selling spree to cut losses, which further fuels the negative sentiment. Being bearish indicates negative sentiment regarding an asset, such as stocks. 2  Typically this indicates a perception that the value of the underlying asset (such as the common stock) will reduce in value over a given time frame. 3  Being bullish indicates positive sentiment regarding an asset.