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lib/channels/stbands/stbands.md
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# STBANDS: Super Trend Bands
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Channel |
| **Inputs** | OHLCV bar (TBar) |
| **Parameters** | `period` (default DefaultPeriod), `multiplier` (default DefaultMultiplier) |
| **Outputs** | Multiple series (Upper, Lower, Trend, Width) |
| **Output range** | Tracks input |
| **Warmup** | `period` bars |
### TL;DR
- Super Trend Bands provide ATR-based dynamic support and resistance levels with asymmetric ratchet logic: the upper band only tightens downward duri...
- Parameterized by `period` (default defaultperiod), `multiplier` (default defaultmultiplier).
- 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.
Super Trend Bands provide ATR-based dynamic support and resistance levels with asymmetric ratchet logic: the upper band only tightens downward during downtrends, and the lower band only tightens upward during uptrends. This creates natural trailing stop-loss levels that respect market momentum. A trend direction signal ($+1$ or $-1$) flips when price breaches the opposite band. The ATR is computed as a simple moving average of True Range via a ring buffer with running sum, providing O(1) streaming updates.
## Historical Context