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Indicators & Calculations · Lesson 4

Bollinger Bands

Measuring volatility

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Bollinger Bands

In this lesson

Read Bollinger Bands as a volatility gauge: squeezes, expansions and walking the band.

Key takeaways

  • Bollinger Bands = 20-period average ± 2 standard deviations.
  • Narrow bands (a squeeze) show low volatility, which often comes before a big move.
  • The squeeze does not tell you the direction.
  • In strong trends price can ride along a band; a touch is not a signal by itself.
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