In trending markets, timing matters. Entering too early can trap you, but if you enter late, you miss out on the profits. The Parabolic SAR was designed to solve this problem. It helps traders stay aligned with the trend and identify possible exit points.
This blog walks you through the functioning of the Parabolic SAR and how it can be combined with other indicators.
How Parabolic SAR works
The Parabolic SAR (Stop and Reverse) was developed by James J. Welles Wilder Jr. It is an indicator used in technical analysis to identify the trend direction and potential reversal points. It helps traders in determining their entry and exit positions as well as in placing the stop-loss.
The Parabolic SAR appears as a series of dots placed above or below the price candles.
- When the dots are above the price level, it signals a downtrend.
- When the dots appear below the price, it reflects an uptrend.
- When the dots flip sides, it may indicate a potential reversal.
The calculation of Parabolic SAR is done with the formula given below:
Uptrend: PSAR = Prior PSAR + Prior AF (Prior EP – Prior PSAR)
Downtrend: PSAR = Prior PSAR – Prior AF (Prior PSAR – Prior EP)
where PSAR is the previous period’s SAR value.
EP is the Extreme Point, which means the highest high in an uptrend or the lowest low in a downtrend.
AF is the Acceleration Factor that is set at 0.02 by default and increases by 0.02 for each new EP up to a maximum of 0.20.
Uptrend Calculation
Let’s assume the prior PSAR is ₹100, the previous EP stands at ₹110, and the AF is 0.02.
PSAR = ₹[100 + 0.02 × (110 − 100)]
PSAR = ₹[100 + 0.02 × 10]
PSAR = ₹[100 + 0.2] = ₹100.2
Downtrend Calculation
Suppose the prior PSAR is ₹200, the last EP is ₹180, and the AF is 0.02
PSAR = ₹[200 − 0.02 × (200 − 180)]
PSAR = ₹[200 − 0.02 × 20]
PSAR = ₹[200 − 0.4] = ₹199.6
When can Parabolic SAR be used?
The Parabolic SAR is most effective in trending markets. It can be for the following:
- Identifying Trend Direction
The Parabolic SAR makes it easy to visually identify whether the market is moving upward or downward. The placement of dots above or below the price level helps in quickly understanding the prevailing trend without any overcomplications. - Setting Stop-Loss
The indicator works as a dynamic stop-loss. As the trend progresses, the dots move with it. This helps in protecting the gains and taking exits in a systematic manner. - Spotting Reversals
When the PSAR dots switch sides, it means that the current momentum might be fading. Traders use this as an early warning and adjust their positions accordingly. - Managing Trade Discipline
It helps in maintaining trading discipline. By providing rule-based signals, the PSAR eliminates guesswork and emotions. It gives a structured approach that improves consistency of the trading strategy.
Other Indicators that Complement Parabolic SAR
The Parabolic SAR can be used in conjunction with other indicators that help in confirmation and make the signals more credible.
Relative Strength Index (RSI)
The RSI is a momentum oscillator that measures the speed and change of price movement. It ranges from 0 to 100 and shows whether the current market conditions are oversold or overbought. The RSI is combined with Parabolic SAR to confirm whether a signal has strength behind it.
Example: Stock XYZ Ltd. is currently trading at ₹500, and the SAR drops below the price, signalling a bullish trend. If the RSI moves above 60, it confirms the upward momentum. However, if it stays close to or below 40, it means the signal may be incorrect.
Moving Averages
Moving averages help in identifying the trend direction by smoothing out the price fluctuations. When used with the PSAR, it shows whether the trend is strong or just temporary. The moving average shows the general direction, and the PSAR helps in pinpointing entry/exit levels.
Example: Assume a stock with a 50-day moving average is priced at ₹750, and SAR dots are below the price at ₹740. It means the trend has strong bullish momentum. But if the price falls below the moving average at ₹730 and SAR flips above the price at ₹735, it points to a bearish signal.
Average Directional Index (ADX)
The ADX measures the strength of a trend, but it does not indicate the direction. The PSAR helps in identifying trade positions and reversals, while the ADX tells if the current market conditions are suitable to follow the signal.
Example: The shares of a company are trading at ₹400, and the PSAR signals a buy. If ADX moves from 20 to 35 (above 25), it confirms a strong trend. But if the ADX falls to 15, it means the trend is weak, and the SAR signal may lead to a false breakout.
Pros and Cons of the Parabolic SAR
The benefits of using the Parabolic SAR are:
- Easy Interpretation: The Parabolic SAR is visually simple, making it beginner-friendly. The dots clearly show where the trend is downward or upward.
- Trailing Stop-Loss: It automatically adjusts as per the trend, allowing traders to lock in their profits without the need to manually change the stop-loss.
- Effective Signals: The placement of dots and when they flip mark a shift in trend direction, which helps in better timing the entries and exits.
- Customisable Sensitivity: The acceleration factor can be changed to make the indicator more or less responsive to the price change, making it suitable for different timeframes and volatility levels.
The Parabolic SAR also has some drawbacks that should be understood before using it:
- Lagging Nature: Like most trend-following indicators, the Parabolic SAR uses past price data, which can create lags in timing and eat away the gains
- Whipsaws in Sideways Markets: It may produce frequent false signals when the price movement is horizontal, leading to overtrading and losses.
- No Volume Consideration: Only the time and price data are used. Skipping on the volume means it is difficult to judge the strength behind a trend.
- Requires Confirmation: The Parabolic SAR is not reliable on its own. It needs to be combined with other indicators for better accuracy.
Bottomline
The Parabolic SAR is a practical trend-following indicator that helps traders stay aligned with the momentum while efficiently managing their risk. Its strength lies in trending markets where it provides clear signals for trade positions and stop-loss placement.
However, like all technical indicators, it is not foolproof. Using it with other indicators improves its accuracy and reduces false signals.
Understanding when to use Parabolic SAR is the key to making it work effectively in your trading strategy.
FAQ’s
The dots indicate trend direction. Dots below the price suggest an uptrend, while dots above the price suggest a downtrend. A flip in position may signal a potential reversal.
The default setting of 0.02 for the Acceleration Factor, with a maximum of 0.20, works well for most traders. However, adjustments can be made depending on the volatility and trading style.
Yes, Parabolic SAR is effective in trending markets and for setting the stop-loss. However, it should ideally be combined with other indicators for better accuracy.
