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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 Reference RSI: Wilder’s Smoothing Makes the Value Depend on How Much History You Feed It — One Platform Uses 250 Bars to Contain It Wilder's 1978 oscillator, 0-100, default 14 periods, 70/30 lines. His smoothing makes the value depend on how much history you feed it; StockCharts uses 250 bars. Retrieved 2026-09-28. Economy · Sep 28