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lib/dynamics/chop/Chop.md
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# CHOP: Choppiness Index
# CHOP: Choppiness Index
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Dynamic |
| **Inputs** | OHLCV bar (TBar) |
| **Parameters** | `period` (default 14) |
| **Outputs** | Single series (CHOP) |
| **Output range** | Varies (see docs) |
| **Warmup** | `period` bars |
### TL;DR
- The Choppiness Index is a non-directional regime indicator that measures whether the market is trending or trading sideways.
- Parameterized by `period` (default 14).
- Output range: Varies (see docs).
- Requires `period` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
The Choppiness Index is a non-directional regime indicator that measures whether the market is trending or trading sideways. It compares total price movement (sum of True Range) to net price movement (high-low channel width) using a logarithmic ratio, producing a bounded value where high readings indicate choppy/consolidating conditions and low readings indicate trending conditions. CHOP does not indicate direction — only whether directional strategies are likely to succeed. The logarithmic scaling normalizes the output to approximately 0-100 regardless of price level or volatility magnitude.