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volatility — 2 pages

Reference Supertrend: the Name Has No Reference Definition, but Its ATR Component Does Bands placed a multiple of ATR above and below a midpoint. As of 2026-09-23 there is no Wikipedia article for the name, though ATR, its volatility component, is documented. Economy · Sep 23 Reference Bollinger Bands: The Sigma Is a Population Standard Deviation (Divide by n, Not n-1) Middle band is an N-period moving average; upper and lower are MA plus or minus K times an N-period standard deviation. Typical N=20, K=2. The sigma uses divisor n, not n-1. Economy · Sep 23