What is the PPO?
The Percentage Price Oscillator (PPO) is a momentum oscillator used in technical analysis. Developed by George Lane, it measures the rate of change in price relative to its average price over a specified period. It's a versatile tool used to identify potential overbought and oversold conditions, as well as potential trend reversals. Unlike many other oscillators, the PPO doesn't display price itself, but rather the difference between two exponential moving averages (EMAs).
How it Works
The PPO calculates the difference between two EMAs. Typically, a 12-period EMA is subtracted from a 26-period EMA. This difference is then divided by the 26-period EMA, and the result is multiplied by 100. This creates a percentage value that oscillates around a zero line. The signal line, a 9-period EMA of the PPO, is also commonly used for trade signals.
Trading Signals
Buy signals are generated when the PPO line crosses *above* the signal line, or when the PPO crosses above the zero line. Sell signals occur when the PPO line crosses *below* the signal line, or when it crosses below the zero line. Divergence between the PPO and price action can also signal potential reversals – bullish divergence when price makes lower lows but PPO makes higher lows, and bearish divergence vice versa.
Basic Settings
The standard PPO settings are 12, 26, and 9. These represent the periods for the shorter EMA, the longer EMA, and the signal line EMA, respectively. Traders often adjust these settings based on the timeframe they are trading and the volatility of the asset. Shorter periods make the PPO more sensitive, while longer periods smooth out the signal. This indicator is best used in conjunction with other technical analysis tools.