Buonasera sarebbe possile convertire questo codice: canale regressione lineare?
allego foto.
GRAZIE
indicator(“Linear Regression Channel”, shorttitle=”LinReg”, overlay=true)
lengthInput = input.int(100, title=”Length”, minval = 1, maxval = 5000)
sourceInput = input.source(close, title=”Source”)
group1 = “Channel Settings”
useUpperDevInput = input.bool(true, title=”Upper Deviation”, inline = “Upper Deviation”, group = group1)
upperMultInput = input.float(2.0, title=””, inline = “Upper Deviation”, group = group1)
useLowerDevInput = input.bool(true, title=”Lower Deviation”, inline = “Lower Deviation”, group = group1)
lowerMultInput = input.float(2.0, title=””, inline = “Lower Deviation”, group = group1)
group2 = “Display Settings”
showPearsonInput = input.bool(true, “Show Pearson’s R”, group = group2)
extendLeftInput = input.bool(false, “Extend Lines Left”, group = group2)
extendRightInput = input.bool(true, “Extend Lines Right”, group = group2)
extendStyle = switch
extendLeftInput and extendRightInput => extend.both
extendLeftInput => extend.left
extendRightInput => extend.right
=> extend.none
group3 = “Color Settings”
colorUpper = input.color(color.new(color.blue, 85), “”, inline = group3, group = group3)
colorLower = input.color(color.new(color.red, 85), “”, inline = group3, group = group3)
calcSlope(source, length) =>
max_bars_back(source, 5000)
if not barstate.islast or length <= 1
[float(na), float(na), float(na)]
else
sumX = 0.0
sumY = 0.0
sumXSqr = 0.0
sumXY = 0.0
for i = 0 to length – 1 by 1
val = source[i]
per = i + 1.0
sumX += per
sumY += val
sumXSqr += per * per
sumXY += val * per
slope = (length * sumXY – sumX * sumY) / (length * sumXSqr – sumX * sumX)
average = sumY / length
intercept = average – slope * sumX / length + slope
[slope, average, intercept]
[s, a, i] = calcSlope(sourceInput, lengthInput)
startPrice = i + s * (lengthInput – 1)
endPrice = i
var line baseLine = na
if na(baseLine) and not na(startPrice)
baseLine := line.new(bar_index – lengthInput + 1, startPrice, bar_index, endPrice, width=1, extend=extendStyle, color=color.new(colorLower, 0))
else
line.set_xy1(baseLine, bar_index – lengthInput + 1, startPrice)
line.set_xy2(baseLine, bar_index, endPrice)
na
calcDev(source, length, slope, average, intercept) =>
upDev = 0.0
dnDev = 0.0
stdDevAcc = 0.0
dsxx = 0.0
dsyy = 0.0
dsxy = 0.0
periods = length – 1
daY = intercept + slope * periods / 2
val = intercept
for j = 0 to periods by 1
price = high[j] – val
if price > upDev
upDev := price
price := val – low[j]
if price > dnDev
dnDev := price
price := source[j]
dxt = price – average
dyt = val – daY
price -= val
stdDevAcc += price * price
dsxx += dxt * dxt
dsyy += dyt * dyt
dsxy += dxt * dyt
val += slope
stdDev = math.sqrt(stdDevAcc / (periods == 0 ? 1 : periods))
pearsonR = dsxx == 0 or dsyy == 0 ? 0 : dsxy / math.sqrt(dsxx * dsyy)
[stdDev, pearsonR, upDev, dnDev]
[stdDev, pearsonR, upDev, dnDev] = calcDev(sourceInput, lengthInput, s, a, i)
upperStartPrice = startPrice + (useUpperDevInput ? upperMultInput * stdDev : upDev)
upperEndPrice = endPrice + (useUpperDevInput ? upperMultInput * stdDev : upDev)
var line upper = na
lowerStartPrice = startPrice + (useLowerDevInput ? -lowerMultInput * stdDev : -dnDev)
lowerEndPrice = endPrice + (useLowerDevInput ? -lowerMultInput * stdDev : -dnDev)
var line lower = na
if na(upper) and not na(upperStartPrice)
upper := line.new(bar_index – lengthInput + 1, upperStartPrice, bar_index, upperEndPrice, width=1, extend=extendStyle, color=color.new(colorUpper, 0))
else
line.set_xy1(upper, bar_index – lengthInput + 1, upperStartPrice)
line.set_xy2(upper, bar_index, upperEndPrice)
na
if na(lower) and not na(lowerStartPrice)
lower := line.new(bar_index – lengthInput + 1, lowerStartPrice, bar_index, lowerEndPrice, width=1, extend=extendStyle, color=color.new(colorUpper, 0))
else
line.set_xy1(lower, bar_index – lengthInput + 1, lowerStartPrice)
line.set_xy2(lower, bar_index, lowerEndPrice)
na
linefill.new(upper, baseLine, color = colorUpper)
linefill.new(baseLine, lower, color = colorLower)
// Pearson’s R
var label r = na
label.delete(r[1])
if showPearsonInput and not na(pearsonR)
r := label.new(bar_index – lengthInput + 1, lowerStartPrice, str.tostring(pearsonR, “#.################”), color = color.new(color.white, 100), textcolor=color.new(colorUpper, 0), size=size.normal, style=label.style_label_up)
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