Indicator reference › TRIX
TRIX applies a triple-smoothed exponential moving average to price, then takes the percentage rate of change of that triple-smoothed line. The triple smoothing filters out short-term price noise far more aggressively than a single EMA, leaving a cleaner momentum signal built for spotting sustained trend changes rather than every minor wiggle.
TRIX oscillates around zero. Positive and rising means the triple-smoothed trend is accelerating upward; positive and falling means the uptrend is decelerating even though price may still be rising. The zero-line cross is the headline signal — because of the triple smoothing it lags more than most oscillators, but it's also far less prone to whipsaw.
Because of the triple EMA smoothing, TRIX is inherently a lagging indicator — it's built to filter out noise, not to be early. It works best on daily or higher timeframes for identifying established trend changes, not for fast scalping or catching the exact top or bottom.
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A reading of TRIX can be written as an exact rule and checked against historical data — as a full strategy with entries, exits and costs, or as a single condition and what followed it:
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Plot it yourself. Add this indicator to a chart, change every parameter and watch the line move, then backtest how the rule would have behaved on historical data — free on the S&P 500 ETF, no card.
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