パラボリックSAR Complete Guide

What is パラボリックSAR?

The Parabolic SAR (Stop and Reverse) is a trend-following indicator developed by J. Welles Wilder Jr., the creator of the Relative Strength Index (RSI). It is primarily used to identify the direction of an asset's momentum and to provide potential entry and exit points, specifically acting as a trailing stop-loss mechanism. The indicator appears on a chart as a series of dots placed either above or below the price bars. When the dots are below the price, it indicates a bullish trend; when they are above, it signifies a bearish trend. The calculation relies on an Acceleration Factor (AF) that increases as the trend persists. The default parameters are a Step of 0.02 and a Maximum of 0.2. This means the indicator starts sensitive and becomes more aggressive as the price moves in the expected direction, 'locking in' profits. If the price touches or crosses these dots, the trend is considered to have reversed, and the dots flip to the opposite side. Practically, the Parabolic SAR is most effective in trending markets with strong directional moves. In sideways or range-bound markets, it frequently produces 'whipsaws' or false signals. Analysts often combine it with other indicators like the ADX (Average Directional Index) to confirm trend strength before acting on a SAR reversal. It is highly valued for its objective exit signals, removing emotional bias from trade management.

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