BTC: Closing Quote Bands Daily20 - Lower

Bitcoin Closing Quote Bands Daily20 - Lower was $74,387.44 on 7 Nov 2026 (latest daily value).

The lower closing-quote band: BTC's 20-day closing mean minus two sample standard deviations of the same 20 daily closes.

Why use it. Mark a level two sample deviations below the recent average close, scaled by how variable recent closes have been. How to read it. One USD/BTC line, separate from the middle and upper bands and never summed with them. A close below it is more than two sample deviations under the 20-day mean; the band moves further from the mean when closes vary more. It is a statistical comparison, not a forecast or trading signal. A missing or nonpositive quote leaves the window undefined. Points are UTC days labelled at the day start, the open day a labelled partial; values are provisional and revisable.

Calculation. Lower = arithmetic mean of 20 adjacent positive admitted daily closing quotes - 2 × their sample standard deviation, computed as the population deviation × the square root of 20/19 (variance divisor 19). A full window is required. Historical quotes are retrospective, with unknown original publication time and venue. The full retained history is computed before the view is filtered.