// See http://trader.online.pl/MSZ/e-ex-Historical_Volatility_System_Connors_Raschkes.html
//
// Note the version on the amibroker site has a mistake
//     Connors/Raschke say buy based on "either an inside day or an NR4 day"
//        but formula 115 uses AND instead of OR.
logRocc = log(C/Ref(C,-1));
HistVol = StDev(logRocc,5) / StDev(logRocc,99);

H_L = H-L;
NR4 = H_L == LLV(H_L,4);


Plot(HistVol, "HistVol", ParamColor("Color", colorCycle), styleLine);

Plot(0.5,"",colorBlack, styleDashed);

Plot(IIf(HistVol>0.5, 3, IIf(NR4,6, IIf(Inside(), 9, 3))),
	"NR4 or Inside", 
	IIf(HistVol>0.5, colorLightGrey, IIf(NR4,colorLime, IIf(Inside(), colorBlue, colorLightGrey))), 
	styleOwnScale|styleArea|styleNoLabel, -0.5, 50);


NumColumns = 5;
Column0 = HistVol;
Column0Name = "HistVol";

Column1 = NR4;
Column1Name = "NR4Day";

Column2 = Inside();
Column2Name = "Inside";

Column3 = High+0.125;
Column3Name = "Buy Stop";

Column4 = Low-0.125;
Column4Name = "Sell Stop";

Filter = HistVol < 0.5 AND (NR4 OR Inside());
Buy = Filter;