Indicator Lab · PSAR · Trend structure
Parabolic SAR
Carries a price reference forward using an extreme point, acceleration factor and direction state.
BTCUSDC · 1h · latest 30 complete days · shared snapshot · no account required
When does the recursive stop-and-reverse line change its direction state?
Carries a price reference forward using an extreme point, acceleration factor and direction state.
One dataset, the same parameters and the same candle for application and explanation.
BTCUSDC · confirmed hourly candles
Snapshot retrieved: 11 Oct 2026, 15:52 UTC · stored snapshot · background refresh scheduled · age when opened: 3,138.6 min
11 Sept 2026, 15:00 — 11 Oct 2026, 15:00 UTC · 720 evaluation candles · 3000 earlier candles for warm-up only. Your opened snapshot stays fixed. A visit can refresh a stale cache in the background for later visitors; fetching fresh is not a tick stream.
Parameters and precise application
Explicit formula parameter of the calculation convention described below.
Explicit formula parameter of the calculation convention described below.
Directional rule · long or cash
BUY when the actual close crosses the primary line from below; SELL on the reverse cross. Synthetic lines are not fill prices. Confirmed closes only; cash start, no shorts/pyramiding. Fills no earlier than the next open with fees and slippage. Thresholds are analysis conventions, not optimized recommendations.
Shared capital and cost model
Includes the buy fee; the remainder stays in cash.
One adverse markup/markdown. Do not add spread a second time.
1 = next open. No retroactive trade at the signal close.
Preparing the calculation module. The shared market snapshot is already available.
Calculation and interpretation of the same candle
Point location and state changes describe the algorithmic reference; the trading rule determines how this becomes a later executable signal.
SARnext=SAR+AF·(ExtremePoint−SAR); reversals and prior-high/low clamps follow TA-Lib
TA-Lib SAR with one acceleration step and maximum; not the separate af0/af variant in some libraries.
Plotted SAR points are not guaranteed stop fills. Frequent direction changes and price gaps can create costs and losses.
Checked sources and reproducibility
- TA-Lib · SAR · v0.6.4
Original C reference implementation. Custom scaling and additional lines are described separately. · checked 2026-10-11
- pandas-ta 0.4.71b0 · pandas_ta/trend/psar.py
Verified original file from the versioned library; the implemented convention and deliberate differences accompany the formula. · checked 2026-10-11
- The Probability of Backtest Overfitting
Why selection across many historical trials can produce misleading results. This tool does not estimate PBO or claim out-of-sample profitability. · checked 2026-10-11
Data source, versions and hash
- Market data source
- https://data-api.binance.vision/api/v3/klines?symbol=BTCUSDC&interval=1h&startTime=1778338800000&endTime=1791730799999
- Specification
- indicator-library-1.0.0
- Execution model
- signal-simulation-1.0.0
- Data hash
- 42ac75e03e017bcac023d319dabb0928e0562fda0e51f4bfa5549ac50e3e8be4
- Disclosed candles including warm-up
- 3720
The sources support definitions and methodological limits. They do not establish profit for this specific BTCUSDC rule. This analysis is descriptive; parameter trials on the same history are not independent out-of-sample evidence. Parity with a deployed unCoded engine is not claimed.