Bollinger Band 4

45 0 2
Using the 5 day SMA . We are measuring 2x the standard deviation. To predict future short term stock prices.
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study(shorttitle="BB", title="Bollinger Bands 5", 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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