ETF to Futures Half Gap

March 10th, 2021, 05:31 PM

Here's a handy script. I find that half gaps are often good bounce/resistance points. That would be half of the distance between the previous days' ETF close and the next open at 930am EST.

Place it on a futures chart and see if you like it. The default setting is for SPY. So you would want to view it on the /ES chart.

Code

#  name: ETF_to_Futures_HalfGap

#input Choose_Underline_Equity = "";
# use GLD (for /GC), USO (for /CL), SOYB (for /ZS)
input symbol = "SPY"; #USE SPY SYMBOL IF VIEWING THE /ES CHART
#HIDES WALLS FOR PREVIOUS DAYS
input showOnlyLastPeriod = yes;



#COLLECTS OPEN PRICE FOR CHART SYMBOL
def ChartSymbol = if GetTime() crosses above RegularTradingStart(GetYYYYMMDD()) then open else ChartSymbol[1];

#COLLECTS OPEN PRICE FOR EQUITY SYMBOL
def SymbolData = if open(symbol, AggregationPeriod.DAY, "Last") then open(symbol, AggregationPeriod.DAY, "Last") else SymbolData[1];

#PLOT WALL START/END TIME
def StartTime = 0530;
def EndTime = 1600;

#COUNTER
def startCounter = SecondsFromTime(StartTime);
def endCounter = SecondsTillTime(EndTime);
def RTHPeriod = if startCounter >= 0 and endCounter >= 0 then 1 else 0;

#SESSION PLOT
def RTHPlot = if showOnlyLastPeriod then GetLastDay() <= GetDay() and GetLastYear() <= GetYear() else yes;

#---Add code to convert underlying's (ETF) half gap to its future counterpart
#----------------------ETF Yesterdays close
def Prevclose = close(symbol, AggregationPeriod.DAY, "last") [1] ;

#---------------------- Spy Half gap calc
def HG_Conv = (Prevclose + SymbolData) / 2;

#---------------------- Half Gap CONVERSION CALCULATION
def HG = (ChartSymbol / SymbolData) * HG_Conv;
plot ETF = if RTHPlot and RTHPeriod then HG else Double.NaN;
ETF.SetPaintingStrategy(PaintingStrategy.DASHES);
ETF.SetDefaultColor(Color.PINK);
ETF.SetLineWeight(4);
#---End code to convert underlying's half gap to its future counterpart

#end

ETF to Futures Half Gap

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ETF to Futures Half Gap