Chebyshev's Bollinger Band

MTGOX:BTCUSD   Bitcoin / U.S. Dollar
705 2
Using Chebyshev's theorem on Bollingers Lower band. The new plotted standard deviation gives a more realistic view that capture 80% of all price no matter what distribution the price follows.

Really good support line
Would you care to share the code to build the Chebshev Line?
Everyone likes todo these bear charts right now on BTC... but maybe they are thinking BTC is a stock ? It's a deflationary currency. Going down is something bitcoin has major major problems with... without some cataclysmic event.. if it's not happy, it'll bounce $1200--$1000 for 6 months rather than go down.
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