Helly Efficiency Ratio

It is a variation of the Grimes Efficiency Ratio by Adam H. Grimes explained here:
adamhgrimes.com/a-new-tool-to-measure-trend-strength-the-grimes-efficiency-ratio/
Instead of calculating and then averaging the Donchian Channel Position I use the Keltner channel position, i.e. the HER gives you the average Keltner channel position over the last x days (Keltner channels +/-2.3 ATR20 on EMA20)