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lib/oscillators/stc/stc.md
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# STC: Schaff Trend Cycle
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Oscillator |
| **Inputs** | Source (close) |
| **Parameters** | `kPeriod` (default 10), `dPeriod` (default 3), `fastLength` (default 23), `slowLength` (default 50), `smoothing` (default StcSmoothing.Ema) |
| **Outputs** | Single series (Stc) |
| **Output range** | $0$ to $100$ |
| **Warmup** | 1 bar |
### TL;DR
- The Schaff Trend Cycle is a cyclometric oscillator that applies double-Stochastic normalization to MACD, extracting the cyclical phase hidden withi...
- Parameterized by `kperiod` (default 10), `dperiod` (default 3), `fastlength` (default 23), `slowlength` (default 50), `smoothing` (default stcsmoothing.ema).
- Output range: $0$ to $100$.
- Requires 1 bar of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
The Schaff Trend Cycle is a cyclometric oscillator that applies double-Stochastic normalization to MACD, extracting the cyclical phase hidden within the trend itself. The recursive normalization produces a bounded 0–100 output that reaches extremes earlier than raw MACD while suppressing Stochastic jitter. Developed for currency markets, STC's tendency to flatline at 0 or 100 during strong trends signals continuation rather than reversal — a feature that distinguishes it from conventional momentum oscillators. Output converges toward a square wave in steady-state trending conditions.
## Historical Context