This indicator is developed by Dr. Alexander Elder and is called also the Elder-Rays. The primary principles on which Elder based the oscillator are the following:
Bull Power is calculated by subtracting the 13-periods EMA from the High price.
Bear Power is calculated by subtracting the 13-periods EMA from the Low price.
According to Dr. Elder, this indicator generates the following trading signals:
Buying Conditions:
Essential
1. Prices are trending upwards according to the 13-periods exponential moving average
2. Bear Power is negative, but rising
Optional
3. The latest Bull Power peak is higher than its previous peak
4. Bear Power is rising from a bullish divergence
Selling Conditions:
Essential
1. Prices are trending downwards according to the 13-periods exponential moving average
2. Bull Power is positive, but declining
Optional
3. The latest Bear Power trough is lower than its previous trough
4. Bull Power is declining from a bearish divergence