Trend indicators

Parabolic SAR

Dots below the price in an uptrend and above it in a downtrend, used as a trailing stop that tightens as the trend continues.

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用通俗的话解释

SAR stands for "stop and reverse". The dots follow the price and accelerate as the trend makes new extremes. When the price touches the dots, the trend is considered over and the dots jump to the other side.

计算方法

Each candle the dot moves towards the extreme price of the trend (highest high in an uptrend) by a fraction called the acceleration factor. That factor starts at 0.02 and grows by 0.02 with each new extreme, up to 0.2.

SAR tomorrow = SAR today + AF × (extreme point − SAR today)
AF starts at 0.02, +0.02 at each new extreme, at most 0.20
If the price crosses the SAR, the trend flips: SAR = previous extreme, AF back to 0.02

如何使用

Trailing stop: in a long trade, move your stop to the dot each candle.
Dots flipping sides marks a possible trend change.
Combine with a trend-strength tool such as ADX: SAR works best in trends.

得出结论

Dots far from the price early in a trend, then closing in: the trend is maturing.

示例

In a gold uptrend the dots climb from 2,300 to 2,380 under the candles. When a sharp drop closes below 2,380, the dots switch above the price: a long trader would exit there.

示例中的价格仅作说明。

注意事项

In sideways markets the dots flip constantly and give many losing signals.

一点历史

J. Welles Wilder Jr., 1978, "New Concepts in Technical Trading Systems".

仅供学习参考。没有任何指标或形态能预测未来，本页内容均不构成投资建议。