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Bollinger Trend Following

Chart depicting Nick Radge's bollinger trend following strategy as per his book Unholy Grails. Gives the 100 day SMA with 1xsigma below the mean and 3xsigma above the mean. You buy at the 3xsigma and sell at the 1xsigma.
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study(shorttitle="BB", title="Bollinger Bands", overlay=true)
source = close
length = input(100, minval=1), mult = input(1.0, minval=0.001, maxval=50)
basis = sma(source, length)
dev = mult * stdev(source, length)
upper = basis + 3*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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