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lib/momentum/ppo/Ppo.md
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# PPO: Percentage Price Oscillator
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Momentum |
| **Inputs** | Source (close) |
| **Parameters** | `fastPeriod` (default DefaultFastPeriod), `slowPeriod` (default DefaultSlowPeriod), `signalPeriod` (default DefaultSignalPeriod) |
| **Outputs** | Multiple series (Signal, Histogram) |
| **Output range** | Varies (see docs) |
| **Warmup** | 1 bar |
### TL;DR
- PPO (Percentage Price Oscillator) measures the percentage difference between a fast EMA and a slow EMA.
- Parameterized by `fastperiod` (default defaultfastperiod), `slowperiod` (default defaultslowperiod), `signalperiod` (default defaultsignalperiod).
- Output range: Varies (see docs).
- Requires 1 bar of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "MACD told you the spread in dollars. PPO tells you the spread in percent. One of those actually works across instruments."
PPO (Percentage Price Oscillator) measures the percentage difference between a fast EMA and a slow EMA. It is functionally equivalent to MACD normalized by the slow EMA, producing values that are comparable across instruments with different price levels. The implementation outputs three components: the PPO line, a signal line (EMA of PPO), and a histogram (PPO minus Signal).