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COT (Legacy): Noncommercial Interest Change

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Change in Open Interest for non commercial traders from legacy commitment of traders (COT) report. For the main symbol but also allows to override it. Also allows to include options in consideration.
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study("Noncommercial Interest Change", shorttitle="Noncom Int Chg", precision=0)
force_root = input("", title="Override Product")
is_includeoptions = input(false, type=bool, title="Include Options")

fxroot =
	  ticker == "USDCAD" ? "CD" : 
	  ticker == "USDCAD" ? "CD" : 
	  ticker == "USDCHF" ? "SF" : 
	  ticker == "USDCZK" ? "CZ" : 
	  ticker == "USDHUF" ? "FR" : 
	  ticker == "USDILS" ? "IS" : 
	  ticker == "USDJPY" ? "JY" : 
	  ticker == "USDMXN" ? "MP" : 
	  ticker == "USDNOK" ? "UN" : 
	  ticker == "USDPLN" ? "PZ" : 
	  ticker == "USDRUB" ? "RU" : 
	  ticker == "USDSEK" ? "SE" : 
	  ticker == "USDZAR" ? "RA" : 
	  ticker == "EURUSD" ? "EC" : 
	  ticker == "AUDUSD" ? "AD" : 
	  ticker == "GBPUSD" ? "BP" : 
	  ticker == "NZDUSD" ? "NE" : 
	  ticker == "BRLUSD" ? "BR" : 
	  ""
root = force_root == "" ? fxroot == "" ? syminfo.root : fxroot : force_root
code = root + (is_includeoptions ? "_FO" : "_F") + "_L_CHG"

is_inversed = 
	  ticker == "USDCAD" ? true : 
	  ticker == "USDCAD" ? true : 
	  ticker == "USDCHF" ? true : 
	  ticker == "USDCZK" ? true : 
	  ticker == "USDHUF" ? true : 
	  ticker == "USDILS" ? true : 
	  ticker == "USDJPY" ? true : 
	  ticker == "USDMXN" ? true : 
	  ticker == "USDNOK" ? true : 
	  ticker == "USDPLN" ? true : 
	  ticker == "USDRUB" ? true : 
	  ticker == "USDSEK" ? true : 
	  ticker == "USDZAR" ? true : 
	  false

long_noncom = security("QUANDL:CFTC/"+code+"|1", "D", close) 
short_noncom = security("QUANDL:CFTC/"+code+"|2", "D", close) 
spread = security("QUANDL:CFTC/"+code+"|3", "D", close) 

long = is_inversed ? short_noncom : long_noncom
short = is_inversed ? long_noncom : short_noncom

plot(long, color = green, title="Long")
plot(short, color = red, title="Short")
plot(long-short, color = yellow, title="Net", style=histogram)
plot(spread, color = purple, title="Spread", style=area)
hline(0, color=yellow, linestyle=dashed)
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