Kaufman Efficiency Ratio (also called "generalized fractal efficiency") according to Perry Kaufman books "Smarter Trading" and "Trading Systems & Methods".
See also:
Kaufman Volatility according to Perry Kaufman books "Smarter Trading"
A Notifier for I-Regr Indicator, It alerts when Price Breaks Up or Down I-Regr lines.N
This indicator compares four types of regression (linear, quadratic, logarithmic and exponential) and chooses the one that best fits the data analyzed.
Trend of 8 pairs on one chart