Bollinger Bands %B(RSI, Stoch) [Kru]

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Calculate %B for RSI , Stoch , using Bollinger Bands algorithm.
//
// @author Kruegger
//
// based on RSI/MFI with Bollinger Bands. Dynamic Oversold/Overbought levels, yayy! by @author LazyBear
//
study(title = "RSI/Stoch %B Bolly bands by [Kruegger] based on [LazyBear]", shorttitle="%B(RSI, Stoch)_%D [Kru][LB]")
source = close
length_rsi = input(14, minval=1, title="RSI Length")
length_stoch = input(14, minval=1, title="Stoch Length")
lengthMA = input(14, minval=1, title="MA Length")
lengthD = input(3, minval=1, title="%D Length")
signal = input(3, minval=1, title="Signal smooth")

mult = input(2.0, minval=0.001, maxval=3, title="StDev Mult")
DrawRSI=input(true, title="Draw %B(RSI) ?", type=bool)
DrawStoch=input(false, title="Draw %B(Stoch) ?", type=bool)

// rsi
rsi_k = rsi(source, length_rsi)
rsi = sma(rsi_k,lengthD)
basis_rsi = sma(rsi, lengthMA)
dev_rsi = mult * stdev(rsi, length_rsi)
upper_rsi = basis_rsi + dev_rsi
lower_rsi = basis_rsi - dev_rsi
rsi_b = (rsi-lower_rsi) / (upper_rsi-lower_rsi)

// stoch
stoch_k = stoch(source, high, low, length_stoch)
stoch = sma(stoch_k,lengthD)
basis_stoch = sma(stoch, lengthMA)
dev_stoch = mult * stdev(stoch, length_stoch)
upper_stoch = basis_stoch + dev_stoch
lower_stoch = basis_stoch - dev_stoch
stoch_b = (stoch-lower_stoch) / (upper_stoch-lower_stoch)

// plot %b (RSI, Stoch)
plot(DrawRSI ? rsi_b:na, color=blue, linewidth=1, title="%B(RSI)")
plot(DrawStoch ? stoch_b:na, color=yellow, linewidth=1, title="%B(Stoch)")
//plot(DrawRSI ? rsi_b:na, color= (rsi_b > 0 and rsi_b[1] < 0)?blue:red, linewidth=1, title="%B(RSI)")

// Draw support line
h1 = hline(0.0, color=red, title="Lower Limit")
h2 = hline(1.0, color=green, title="Upper Limit")
h3 = hline(0.5, color=blue, title="Middle Limit")

//plotshape(rsi_b > 0 and rsi_b[1] < 0, color=lime, style=shape.triangleup, text="Buy", location=location.bottom)
//plotshape(rsi_b < rsi_b[signal] and rsi_b[signal] >= rsi_b[signal-1], color=red, style=shape.triangledown, text="Sell", location=location.top)


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