How Do I Calculate Trailing Stop-Loss Order in Indices Trade
Index Trading: Calculating and Implementing a Trailing Stop-Loss in Index Positions
The precise level for setting a trailing stop-loss order can be mathematically derived using specific trading indicators, such as the Parabolic SAR indicator.
If the market price goes up a certain amount, the parabolic SAR tool moves the stop loss level higher as well.
Also if the market falls by a set number of pips the parabolic SAR indicator then adjusts the trailing stop loss level downwards accordingly.
Parabolic SAR Indicator
Parabolic SAR is used by stock traders to set trailing stock price stop loss zones
The Parabolic SAR provides good exit levels that keep trailing the price of a indices.
If you're trading indices in an upwards trend, you should close your buy positions when the price goes down and falls below the parabolic SAR.
In a downward trend scenario, you should close short trading positions when the price surpasses the parabolic SAR indicator level.

Parabolic SAR - Indicator for Setting Trailing Stop-Loss Order Levels
Bollinger Bands Indicator
The Bollinger Bands indicator harnesses the standard deviation metric to gauge price volatility. Given that standard deviation estimates market price fluctuation, the bands possess a self-adjusting characteristic: they expand during intervals of heightened price volatility and contract when volatility subsides.
Bollinger Bands comprise three distinct bands engineered to enclose the vast majority of an instrument's price activity. The central band serves as the benchmark for intermediate-term trend analysis, predominantly calculated as a 20-period simple moving average, and it forms the basis for both the upper and lower bands. The distance separating the outer bands from this middle band is dynamically determined by prevailing price volatility.
Bollinger bands wrap around the stock's price action. Set stop losses just beyond the bands for protection.

Bollinger Bands Indicator
How to Calculate Trailing Stop-Loss Order
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