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The Advance/Decline Ratio is a Market Breadth indicator. The reason it is called Market Breadth indicator is that it uses the number of Advancing and Declining stocks in its formula. The number of advancing stocks is the number of stocks that advanced or increased in price in a trading day. The number of declining stocks is the number of stocks that declined or decreased in price in a trading day.
The Advance Decline Ratio is simply the number of advancing stocks divided by the number of declining stocks. The result is a value that is never lower than zero (ratio). A value that is equal to one means that the number of advancers is equal to the number of decliners. A value higher than one means that more stocks are advancing than stocks that are declining and a value lower than one means that more stocks are declining than stocks that are advancing. Like the advance and decline values, this indicator values move very quickly and thus it is better to use a moving average to smooth the time-series.