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Parabolic SAR (PSAR)

StratCraft indicator page for the PSAR reversal and trailing stop line.

Route: /indicators/psar/

What It Does

PSAR provides a trailing stop style line that can also act as a reversal trigger. It is common in trend-following and exit management systems.

Formula

PSAR iteratively projects a stop-and-reversal level using the current trend direction, acceleration factor, and extreme price.

Parameters

  • period - default 2
  • af - default 0.02
  • afmax - default 0.2

C++23 API

#include <nonabt/indicators/psar.hpp>
auto psar = std::make_unique<nonabt::PSAR>(data(), 2, 0.02, 0.2);

Common Usage

  • Use PSAR as a trailing stop.
  • Use a price cross through PSAR as a trend reversal trigger.
  • Works best when the market is already trending.

Practical Pattern

Buy while price stays above PSAR and exit or reverse when price falls below it.

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