Parabolic SAR

What is Parabolic SAR?

The Parabolic Stop and Reverse (SAR) indicator combines price and time components to generate buy and sell signals. The Parabolic SAR is also effective as a tool to determine where to place stop loss orders. 

Parabolic SAR Buy Signal

We should buy when the price closes above the upper Parabolic SAR. When the Parabolic SAR changes from being above price to below price, then the stock, futures, or currency trader should "stop" and buy to cover their existing short sell and "reverse" direction and buy to go long.

Parabolic SAR Sell Signal

A sell signal is generated when the price closes below the lower Parabolic SAR. At the time that the Parabolic SAR changes from being below price to being above price, the trader should "stop" and sell to exit their existing long trade and "reverse" direction and sell to go short.

Uses of Parabolic SAR 

An effective use of the Parabolic SAR is determining where to place stop loss orders to protect profits or minimize losses. 

The Parabolic SAR is an effective stop loss placement tool for two reasons:

• It acts as a trailing stop. Rather than putting in one stop loss below where a trader entered a long position or above where the trader entered a short position, using the Parabolic SAR as a trader's guide, the stop loss is gradually raised for a long position and lowered in a short position, effectively locking in any profits.

• It acts as a time stop. Time stops are used by traders because they enter in buy or sell orders expecting a certain move to occur. If the expected move never occurs and the reason the trader initiated the trade is no longer relevant, then the trader should exit their trade. Similarly, the Parabolic SAR incorporates time into its calculation making sure a stock, future, or currency trade is working for the trader, if the trade is not moving in the desired direction, the Parabolic SAR will signal an exit.

Parabolic SAR Weaknesses

Parabolic SAR introduces some excellent concepts to technical analysis but leaves two major weaknesses:

• Trend speeds vary over time and between stocks. It is difficult to arrive at one acceleration factor that suits all trends -- it will be too slow for some and too fast for others.

• The SAR system assumes that the trend changes every time a stop has been hit. Any trader will tell you that your stops may be hit several times while the trend continues. Price merely retraces through your stop and then resumes the up-trend, leaving you lagging behind. 

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