Theory :
Schaff trend cycle, as defined and described by Dough Schaff, is a sort of double stochastic of a macd. Macd is calculated as em(fast) – ema(slow). Here is a version that replaces ema in the calculation with Hull average.
Usage :
The usual way Schaff trend cycle is used – color changes can be used for signals, or you can define some levels as triggers for signals