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lib/reversals/psar/Psar.md
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# PSAR: Parabolic Stop And Reverse
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Reversal |
| **Inputs** | OHLCV bar (TBar) |
| **Parameters** | `afStart` (default DefaultAfStart), `afIncrement` (default DefaultAfIncrement), `afMax` (default DefaultAfMax) |
| **Outputs** | Single series (Psar) |
| **Output range** | Varies (see docs) |
| **Warmup** | `1` bars |
### TL;DR
- The Parabolic Stop And Reverse (PSAR) is a trend-following overlay indicator created by J.
- Parameterized by `afstart` (default defaultafstart), `afincrement` (default defaultafincrement), `afmax` (default defaultafmax).
- Output range: Varies (see docs).
- Requires `1` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "The trend is your friend until the end when it bends." — Ed Seykota
## Introduction