SpreadEagle71

High Low Bollinger Bands

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Better than Bollinger Bands for finding extreme points timed by an oscillator where the price is statistically likely to stay inside the boundaries.
Good for setting credit spreads such as call and put vertical spreads.
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study(shorttitle="HL BB", title="High Low Bollinger Bands", overlay=true)
length = input(20, minval=1)
src = input(low, title="Source")
src2 = input(high, title="Source2")
mult = input(3.0, minval=0.001, maxval=50)
mult2 = input(3.0, minval=0.001, maxval=50)
basis = sma(src, length)
basis2 = sma(src2, length)
dev = mult * stdev(src, length)
dev2= mult2 * stdev(src2,length)
upper = basis2 + dev2
lower = basis - dev
plot(basis, color=orange)
plot(basis2,color=orange)
p1 = plot(upper, color=red)
p2 = plot(lower, color=blue)
fill(p1, p2)
Nice job !
But how can you give also a alert when it reach the lower bollinger band ? How is the script then ?
Can you help me. Thank you.
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