Historical Volatility based Standard Deviation_V2This Plots the Standard Deviation Price Band based on the Historical Volatility. SD 1, 2, 3.
Version update: 
Fixed the Standard Deviation mistake on Version 1. 
Added Smoothing Options for those who prefer a less choppy version.
Standard Deviation 3 plot is not set to Default
Historical-volatility
Historical Volatility Strategy Strategy buy when HVol above BuyBand and close position when HVol below CloseBand.
 Markets oscillate from periods of low volatility to high volatility 
 and back. The author`s research indicates that after periods of 
 extremely low volatility, volatility tends to increase and price 
 may move sharply. This increase in volatility tends to correlate 
 with the beginning of short- to intermediate-term moves in price. 
 They have found that we can identify which markets are about to make 
 such a move by measuring the historical volatility and the application 
 of pattern recognition.
 The indicator is calculating as the standard deviation of day-to-day 
 logarithmic closing price changes expressed as an annualized percentage.

