গড় অভিযোজিত চ্যানেল মূল্য ব্রেকআউট কৌশল

/*backtest
start: 2022-10-26 00:00:00
end: 2023-11-01 00:00:00
period: 1d
basePeriod: 1h
exchanges: [{"eid":"Futures_Binance","currency":"BTC_USDT"}]
*/

//@version=4

// CryptoStatistical - 2019
// AMA Strategy Channel Breakout Strategy from E. Durenard - Professional Automated Trading 
// https://www.amazon.com/Professional-Automated-Trading-Theory-Practice/dp/1118129857

strategy(title="[CS] AMA Strategy - Channel Break Out", shorttitle="AMA_ChannelBreakout_Strategy", initial_capital = 1000, overlay=true, pyramiding = 0, calc_on_every_tick=false, calc_on_order_fills=false, commission_type= strategy.commission.percent, commission_value = 0.08, currency=currency.USD)
testStartYear = input(2019, "Backtest Start Year")
testStartMonth = input(6, "Backtest Start Month")
testStartDay = input(1, "Backtest Start Day")
testPeriodStart = timestamp(testStartYear,testStartMonth,testStartDay,0,0)

testStopYear = input(2019, "Backtest Stop Year")
testStopMonth = input(12, "Backtest Stop Month")
testStopDay = input(31, "Backtest Stop Day")
testPeriodStop = timestamp(testStopYear,testStopMonth,testStopDay,0,0)

testPeriodBackground = input(title="Color Background?", type=input.bool, defval=true)
testPeriodBackgroundColor = testPeriodBackground and (time >= testPeriodStart) and (time <= testPeriodStop) ? #00FF00 : na
bgcolor(testPeriodBackgroundColor, transp=95)

testPeriod() =>  true

price = input(title='Price Source:', type=input.source, defval=close)

ama = price
hb = price
lb = price

// Static model parameters
minfactor = 0.
maxfactor = 1.
deviation_max = 1.
deviation_min = 1.
beta_hb = 1.
beta_lb = 1.
snr = 1.

normalized_atan= 0.
alpha = 0.5
// Suggested snr-factor from .5 upto 3.1 by .3 to find best parameter
snrfactor = input(title='SNR Factor:', type=input.float, minval=0.6, maxval=3.3, step=0.3, defval=2.1)

// Sensitivity Lookback search for the best perdiod from 5 to 20
lookback = input(title='Sensitivity Lookback:', type=input.integer, defval=5)

// Suggested Beta from .5 below 4.5 by .3, usually in the range 1.2, 1.5
beta = input(title='Beta:', type=input.float, minval=0.6, maxval=4.5, step=0.3, defval=2.1)

offsetlabel = input(title='Offset Label:', type=input.float, minval=0.001, maxval=0.03, step=0.001, defval=0.001)

// pi/2
pi2 = 1.5707963267948966

// Zero-lag resampled moving average (Durschner nwma)
f_nwma(_src, _period) =>
    fast = _period/2
    lambda = _period/fast
    alpha = lambda * (_period - 1)/(_period - lambda)
    average1 = wma(_src,_period)
    average2 = wma(average1,fast)
    nwma = (1+alpha)*average1 - alpha*average2

ama := alpha[1]*price + (1-alpha[1])*nz(ama[1])

deviation_max := alpha[1]*max((price[0] - price[1])/price[1],0) + (1-alpha[1])*nz(deviation_max[1])
deviation_min := -alpha[1]*min((price[0] - price[1])/price[1],0) + (1-alpha[1])*nz(deviation_min[1])

beta_hb := beta*deviation_max
beta_lb := beta*deviation_min
hb := (1 + beta_hb[1])*ama
lb := (1 - beta_lb[1])*ama

snr := if price > hb
    ((price - ama[1])/ama[1])/beta_lb
else
    if price < lb
        -((price - ama[1])/ama[1])/beta_hb
    else
        0

normalized_atan := (atan(snrfactor*snr) + pi2)/(2*pi2)
alpha := f_nwma(minfactor + (maxfactor - minfactor)*normalized_atan, lookback)

plot(ama, color=color.black)
plot(hb, color=color.green)
plot(lb, color=color.red)

// Buy Condition Var
bc = false
// Sell Condition Var
sc = false
d = color.black

// Buy Condition
if(price > hb)
    bc := true
    d := color.green

// Sell Condition
if(price < lb)
    sc := true
    d := color.red

if(testPeriod())
    strategy.entry("Long", strategy.long, when = bc)
    strategy.entry("Short", strategy.short, when = sc)

alertcondition(bc, title='BuyCondition', message='Buy')
alertcondition(sc, title='SellCondition', message='Sell')

plotshape(title='Buy', series=bc ? price * (1 - offsetlabel) : na, text='A1B', style=shape.labelup, location=location.absolute, color=d, textcolor=color.white, offset=0)
plotshape(title='Sell', series=sc ? price  * (1 + offsetlabel) : na, text='A1S', style=shape.labeldown, location=location.absolute, color=d, textcolor=color.white, offset=0)