The Average Directional Index (ADX) is a technical analysis tool that measures the strength of trends. It is a standard analytical tool provided by most trading platforms. To quantify a trend's strength, the calculation of the ADX is based on the moving average (MA) of a price range expansion over a certain timeframe.
The traditional setting for the ADX indicator is 14 time periods, but analysts have commonly used the ADX with settings as low as 7 or as high as 30. Lower settings will make the average directional index respond more quickly to price movement but tend to generate more false signals.