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Bollinger Bands 4

bb4
23 0 3
bb4
Price prediction for 2 standard deviations of the 4 day Simple Moving Average
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study(shorttitle="BB", title="Bollinger Bands 4", overlay=true)
length = input(4, minval=1)
src = input(close, title="Source")
mult = input(2.0, minval=0.001, maxval=50)
basis = sma(src, length)
dev = mult * stdev(src, length)
upper = basis + dev
lower = basis - dev
plot(basis, color=red)
p1 = plot(upper, color=blue)
p2 = plot(lower, color=blue)
fill(p1, p2)
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