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In technical analysis, a line plotting the advance-decline index over a period of time. The advance-decline index takes the total of stock issues increasing on a trading day and subtracts the number of stock issues declining on the same day. Technical analysts use the index as an indicator of market movements, and use the advance-decline line to confirm a movement. If the line slopes upward over time, it indicates an upward trend, and, if it slopes downward, the opposite is true.
advance-decline line (A/D)
The line that results from plotting the advance-decline index over a period of time. The direction of the advance-decline line is used to confirm movements in a stock or the market.