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lib/trends_IIR/coral/Coral.md
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# CORAL — Coral Trend Filter
# CORAL — Coral Trend Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Trend (IIR MA) |
| **Inputs** | Source (close) |
| **Parameters** | `period`, `cd` (default 0.4) |
| **Outputs** | Single series (Coral) |
| **Output range** | Tracks input |
| **Warmup** | `period` bars |
### TL;DR
- The **Coral** filter is a smooth, low-lag trend indicator that chains six cascaded EMA passes and combines stages 3–6 using polynomial coefficients...
- Parameterized by `period`, `cd` (default 0.4).
- Output range: Tracks input.
- Requires `period` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
## Overview