Uses the [Average Directional Index](https://www.investopedia.com/terms/a/adx.asp) to find reversals. The default implementation is according to [Investopedia's ADX: The Trend Strength Indicator](https://www.investopedia.com/articles/technical/02/041002.asp).<br><br>Evaluates -1 to 1 according to the current price using the [Exponential Moving Average](https://www.investopedia.com/terms/e/ema.asp) with a length of 20 coupled with the [ADX](https://www.investopedia.com/terms/a/adx.asp).