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[amibroker] AFL - screen for outliers



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I am trying to do a simple screen to find issues that are outside 3 standard deviations of Bollinger band.
 
The code below seems to work .. of sorts, but when I plot the chart, the results are not outside the bands.
 
Appreciate another pair of eyes looking at this.
 
Ara
 
===============================================================
 
 
NumDevs  = Param("NumDevs",3,1,4,1);
 
Top  = BBandTop(C,20,numdevs);
Bot  = BBandBot(C,20,numdevs);
 
HiLo   = IIf (Close > Top,1,IIf(Close < Bot,-1,0));
 

PlotOHLC(Open,High,Low,Close,"",colorBlack,styleCandle);
Plot(Top,"",colorRed,styleLine);
Plot(Bot,"",colorRed,styleLine);
//
//
Filter = HiLo ==1 OR HiLo ==-1;
AddColumn(Close,"Close");
AddColumn(HiLo,"HiLo");
 

"Close  " + Close;
"Top     " + Top;
"Bot     " + Bot;
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