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lib/dynamics/adx/Adx.md
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# ADX: Average Directional Index
# ADX: Average Directional Index
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Dynamic |
| **Inputs** | OHLCV bar (TBar) |
| **Parameters** | `period` |
| **Outputs** | Multiple series (DiPlus, DiMinus) |
| **Output range** | Varies (see docs) |
| **Warmup** | `period * 2` bars |
### TL;DR
- The Average Directional Index is the industry-standard measure of trend strength, ignoring direction entirely to focus on the velocity of price exp...
- Parameterized by `period`.
- Output range: Varies (see docs).
- Requires `period * 2` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
The Average Directional Index is the industry-standard measure of trend strength, ignoring direction entirely to focus on the velocity of price expansion. Wilder's pipeline decomposes range into directional movement (+DM, -DM), normalizes against True Range to produce directional indicators (+DI, -DI), derives a directional index (DX) from their ratio, then smooths DX with a final RMA pass. The double-smoothed architecture creates significant lag but exceptional noise rejection, making ADX a regime filter rather than a timing tool. Output is unbounded above 0, with readings above 25 conventionally indicating trending conditions and below 20 indicating choppy markets.