Esta estratégia é baseada no indicador clássico de Bollinger Bands. Ele vai longo quando o preço fecha acima da faixa superior e fica curto quando o preço fecha abaixo da faixa inferior. Ele pertence à tendência após a estratégia de ruptura.
Os riscos podem ser mitigados através da definição de stop loss, da consideração de taxas de transação ou da adição de filtros de indicadores.
A lógica geral desta estratégia é clara. Ajusta o risco através da largura da banda de desvio padrão e evita falsas rupturas usando ruptura próxima. Mas ainda é necessário evitar perdas oscilantes usando stop loss, adicionando filtros etc.
/*backtest start: 2023-11-13 00:00:00 end: 2023-11-20 00:00:00 period: 1m basePeriod: 1m exchanges: [{"eid":"Futures_Binance","currency":"BTC_USDT"}] */ //@version=4 //┌───── •••• ─────┐// // TradeChartist // //└───── •••• ─────┘// //Bollinger Bands is a classic indicator that uses a simple moving average of 20 periods along with upper and lower bands that are 2 standard deviations away from the basis line. //These bands help visualize price volatility and trend based on where the price is in relation to the bands. //This Bollinger Bands filter plots a long signal when price closes above the upper band and plots a short signal when price closes below the lower band. //It doesn't take into account any other parameters such as Volume/RSI/fundamentals etc, so user must use discretion based on confirmations from another indicator or based on fundamentals. //This filter's default is 55 SMA and 1 standard deviation, but can be changed based on asset type //It is definitely worth reading the 22 rules of Bollinger Bands written by John Bollinger. strategy(shorttitle="BB Breakout Strategy", title="Bollinger Bands Filter", overlay=true, pyramiding=1, currency=currency.NONE , initial_capital = 10000, default_qty_type = strategy.percent_of_equity, default_qty_value=100, calc_on_every_tick= true, process_orders_on_close=false) src = input(close, title = "Source") length = input(55, minval=1, title = "SMA length")// 20 for classis Bollinger Bands SMA line (basis) mult = input(1., minval=0.236, maxval=2, title="Standard Deviation")//2 for Classic Bollinger Bands //Maxval = 2 as higher the deviation, higher the risk basis = sma(src, length) dev = mult * stdev(src,length) CC = input(true, "Color Bars") upper = basis + dev lower = basis - dev //Conditions for Long and Short - Extra filter condition can be used such as RSI or CCI etc. short = src<lower// and rsi(close,14)<40 long = src>upper// and rsi(close,14)>60 L1 = barssince(long) S1 = barssince(short) longSignal = L1<S1 and not (L1<S1)[1] shortSignal = S1<L1 and not (S1<L1)[1] //Plots and Fills ////Long/Short shapes with text // plotshape(S1<L1 and not (S1<L1)[1]?close:na, text = "sᴇʟʟ", textcolor=#ff0100, color=#ff0100, style=shape.triangledown, size=size.small, location=location.abovebar, transp=0, title = "SELL", editable = true) // plotshape(L1<S1 and not (L1<S1)[1]?close:na, text = "ʙᴜʏ", textcolor = #008000, color=#008000, style=shape.triangleup, size=size.small, location=location.belowbar, transp=0, title = "BUY", editable = true) // plotshape(shortSignal?close:na, color=#ff0100, style=shape.triangledown, size=size.small, location=location.abovebar, transp=0, title = "Short Signal", editable = true) // plotshape(longSignal?close:na, color=#008000, style=shape.triangleup, size=size.small, location=location.belowbar, transp=0, title = "Long Signal", editable = true) p1 = plot(upper, color=#ff0000, display=display.all, transp=75, title = "Upper Band") p2 = plot(lower, color=#008000, display=display.all, transp=75, title = "Lower Band") p = plot(basis, color=L1<S1?#008000:S1<L1?#ff0000:na, linewidth=2, editable=false, title="Basis") fill(p,p1, color=color.teal, transp=85, title = "Top Fill") //fill for basis-upper fill(p,p2, color=color.orange, transp=85, title = "Bottom Fill")//fill for basis-lower //Barcolor bcol = src>upper?color.new(#8ceb07,0): src<lower?color.new(#ff0000,0): src>basis?color.green: src<basis?color.red:na barcolor(CC?bcol:na, editable=false, title = "Color Bars") // //Alerts ---- // Use 'Once per bar close' // alertcondition(condition=longSignal, title="Long - BB Filter", message='BB Filter Long @ {{close}}') // Use 'Once per bar close' // alertcondition(condition=shortSignal, title="Short - BB Filter", message='BB Filter Short @ {{close}}') // Use 'Once per bar close' Notestart1 = input(true, "╔═══ Time Range to BackTest ═══╗") // === INPUT BACKTEST RANGE === FromMonth = input(defval=1, title="From Month", minval=1, maxval=12) FromDay = input(defval=1, title="From Day", minval=1, maxval=31) FromYear = input(defval=2018, title="From Year", minval=2015) ToMonth = input(defval=1, title="To Month", minval=1, maxval=12) ToDay = input(defval=1, title="To Day", minval=1, maxval=31) ToYear = input(defval=9999, title="To Year", minval=2010) // === FUNCTION EXAMPLE === start = timestamp(FromYear, FromMonth, FromDay, 00, 00) // backtest start window finish = timestamp(ToYear, ToMonth, ToDay, 23, 59) // backtest finish window window() => // create function "within window of time" time >= start and time <= finish ? true : false if(window()) strategy.entry("Long", long=true, when = longSignal) // strategy.close("Long", when = (short and S3==0), comment = "Close Long") if(window()) strategy.entry("Short", long=false, when = shortSignal) // strategy.close("Short", when = (long and L3==0), comment = "Close Short")