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Stacking similar oscillators
RSI + Stochastic + Williams %R + CCI on one chart. They all measure overbought/oversold from the same input. Three confirmations of one bet, not three independent signals.
Pick one oscillator. Trust it.
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Trading oscillator reversals in trends
RSI sits at 80 for 12 sessions while price rips. You short every "overbought" signal. RSI doesn't care that price is trending. Oscillators are mean-reversion tools — they fail in trending regimes.
Use ADX or Choppiness Index to filter regime first.
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Curve-fitting parameters
"I tested RSI(9) instead of RSI(14) — backtest looks better!" Now your strategy fits the past, not the future. Defaults are defaults because they generalise. Optimisation = overfitting.
Use defaults. Earn improvements through structure, not tuning.
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Indicator-only entries
"RSI < 30 = buy." That's an indicator playing trader. An indicator alone has no structural context. RSI < 30 in a downtrend means "still oversold and falling further".
Lead with structure (BOS/CHoCH/OB). Indicator confirms.
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Timeframe mismatch
RSI(14) on M1 ≠ RSI(14) on D1 in meaning — one measures noise, the other the regime. Match indicator timeframe to your trade timeframe. Don't take an M5 RSI signal as confirmation of an H4 setup.
Indicator TF = trade TF. Always.