The FXB.ta.RAVI class calculates RAVI: very similar to the Price Oscillator except that the numerator in the calculation is the absolute difference between the averages rather than a directional positive/negative. It is a value-based calculation, and can be applied to any series of values including the output of another FXB.ta calculation. Parameters are as follows:
| Parameter | Description |
| fast | Period for fast moving average (e.g. 12) |
| slow | Period for slow moving average (e.g. 26) |
| maType | Type of moving average for the fast and slow averages. Defaults to an exponential moving average (ema / 1). |
