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lib/momentum/tsi/Tsi.md
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# TSI: True Strength Index
# TSI: True Strength Index
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Momentum |
| **Inputs** | Source (close) |
| **Parameters** | `longPeriod` (default DefaultLongPeriod), `shortPeriod` (default DefaultShortPeriod), `signalPeriod` (default DefaultSignalPeriod) |
| **Outputs** | Single series (Tsi) |
| **Output range** | $-1$ to $+1$ |
| **Warmup** | 1 bar |
### TL;DR
- The True Strength Index (TSI) is a momentum oscillator developed by William Blau that uses double-smoothed exponential moving averages of price mom...
- Parameterized by `longperiod` (default defaultlongperiod), `shortperiod` (default defaultshortperiod), `signalperiod` (default defaultsignalperiod).
- Output range: $-1$ to $+1$.
- Requires 1 bar of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
The True Strength Index (TSI) is a momentum oscillator developed by William Blau that uses double-smoothed exponential moving averages of price momentum to reduce noise and identify trend strength and direction.