[amibroker] Volatility Breakout with Bollinger Bands

[Bill Halliday <halliday_mo@xxxxxxxxx>]

I wrote this email to Joachim Feseck at joachimfeseck@xxxxxx, but the address in no-longer valid. This is the program he uploaded to the ALF Library on 2003-01-19 :
 
  Volatility Breakout with Bollinger Bands
  
Band= (BBandTop( C, 20, 2 ) - BBandBot( C, 20, 2)) / MA(Close, 20 ) * 100;
B= ((Close - BBandBot( Close, 20, 2 )) / (BBandTop( Close, 20, 2 ) - BBandBot(
Close, 20, 2 ))) * 100;
   
  Buy = band < 15 AND b > 95 AND MFI(10) > 60;
Sell = Cross(Close,SAR(0.01,0.2));
Short = band < 15 AND b < 5 AND MFI(10) < 40;
Cover = Cross(SAR(0.01,0.2), Close);
   
  Filter = (band < 15 AND b > 95 AND MFI(10) > 60)  OR (band < 15 AND b < 5 AND MFI(10) < 40);
   
  NumColumns = 1;
Column0 = Close;
 
Could someone explain what B is? 
  
Highlighted are comments I don't understand, could anyone expand on them for me?
 
Description:
 
This Tradingsystem gives buy and short signals when after Bollinger Bands got very narrow they spread out and the Close touches the band (top or bottom). Additionally the MFI has to confirm this volatility breakout. But please be carefull because some stock suddenly change direction and in this case the really change! For more information please read "Bollinger on Bollinger Bands".
  
Thanks,
  
Bill


 
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