Parabolic SAR: What the Dots Below Price Show
Parabolic SAR stands for stop and reverse. It is less an indicator of direction than a mechanism for trailing a stop that flips itself on a reversal.
The Parabolic SAR indicator: how it is calculated
The dots are built by a formula that pulls the level toward price with acceleration: the longer the move continues, the faster the dots close in. When price touches a dot a flip occurs — the dots jump to the other side and direction changes. The indicator has no intermediate out-of-market state by construction.
How many signals it produces on real data
- Rule tested: Parabolic SAR dots below price
- State changes over the sample: 47 — about 22.9 a year
- Share of bars in the signal state: 51.9%
Measured across 518 daily bars for each of 12 currency pairs. This measures frequency, not profitability: it shows how many decisions the tool demands of a trader. The data is public and the calculation is reproduced by a script in the repository.
How it differs from similar tools
SAR differs from other indicators in always being in a position. That is not a setting but a consequence of design: the indicator was created to hold a stop in a trend trade, not to decide whether to trade at all.
How to apply it
Its practical value is precisely in trailing a stop. The measurement gave 23 flips a year — on average once every two and a half weeks, which is reasonable for a medium-term trade. Using SAR as a source of entries is worse: flips also occur in ranges, where they are meaningless, and the acceleration pulls the stop too close to price in an extended move.
Common mistakes
The main mistake is trading every flip in sequence. In a ranging market the dots jump almost every bar, and a run of such trades is eaten by spread costs. The second is ignoring the acceleration: in a long trend SAR closes in so tightly that it exits the position on an ordinary pullback.
This material is for educational purposes and is not individual investment advice.
Frequently asked questions
What do the Parabolic SAR dots mean?
The stop level for the current direction. Dots below price correspond to an upward phase, above price to a downward one, and their jump means the position flips.
How often does Parabolic SAR flip?
In our measurement across 12 pairs, about 23 times a year — roughly once every two and a half weeks. In a ranging market the frequency rises sharply.
Can you use SAR for entries?
Less well than for stops. The indicator is always in a position by design and flips in ranges, where its signals are meaningless. Its strength is trailing a stop in a trend trade.
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