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volatility — 2 pages

Reference Supertrend (TradingView Implementation): hl2 Plus or Minus a Multiple of ATR, With a Ratcheting Band and a Close-Based Flip An ATR-based trend line as TradingView implements it: bands at hl2 +/- multiplier x ATR that ratchet, flipping when the close passes the opposite band. TradingView attributes it to Olivier Seban. Economy · Oct 8 Reference Two Standard Deviations Does Not Mean 95 Percent — Bollinger’s Own Rules Say About 90, and a Band Tag Is Not a Signal John Bollinger's published rules say to make no statistical assumptions from the bands: about 90 percent of data falls inside, not 95, and a tag is not a signal. Retrieved 2026-09-28. Economy · Sep 30