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Try this....you can load this formula into Indicator Builder to get a visual
of expansion and contraction.....
and also load this formula into AA , n last quotation and n=1 and click
explore.
//Bollinger Bands with Expansion and Contraction
//HIGHLIGHTS
// Contraction Color: Blue
pds=20;//bollinger bands periods
shift=2;//bollinger band shift
ChartStyle=styleCandle;
Cond1= BBandTop(Close,pds,shift)< Ref(BBandTop(Close,pds,shift),-1) AND
BBandBot(Close,pds,shift)>Ref(BBandBot(Close,pds,shift),-1);
// Expansion Color: Red
Cond2= BBandTop(Close,pds,shift)> Ref(BBandTop(Close,pds,shift),-1) AND
BBandBot(Close,pds,shift)<Ref(BBandBot(Close,pds,shift),-1);
barcolor=IIf(Cond1,6,IIf(Cond2,4,0));
Graph0=BBandTop(C,pds,shift);
Graph1=C;
Graph1Color=colorBlack;
Graph1Style=ChartStyle;
Graph2=BBandBot(C,pds,shift);
Graph0Style=Graph2Style=1;
Graph0BarColor=Graph2BarColor=ValueWhen(barcolor!=0,barcolor);
/**********************************************************/
Lookback=10;
diff=BBandTop(Close,pds,shift)- BBandBot(Close,pds,shift);
contraction_cond=IIf(diff < Ref(LLV(diff,Lookback),-1),1,0);
expansion_cond=IIf(diff > Ref(HHV(diff,Lookback),-1),1,0);
present=WriteIf(Cond1,"Contraction","Expansion");//is the market currently
under expansion or contraction
Filter=Cond1 > 0 OR Cond2 > 0 AND Close > 0 AND Close < 25 AND Volume > 5000
AddColumn(IIf(Cond1,C,IIf(Cond2,C,C)),"close");
AddColumn(Cond1,"contract");AddColumn(ValueWhen(Cond1,BBandTop(Close,pds
shift)-BBandBot(Close,pds,shift),1),"ContractValue");
AddColumn(Cond2,"expand");AddColumn(ValueWhen(Cond2,BBandTop(Close,pds
shift)-BBandBot(Close,pds,shift),1),"ExpansionValue");
AddTextColumn(Present,"Condition");
AddColumn(RSI(),"RSI");AddColumn(ADX(),"ADX");
Anthony
-------Original Message-------
From: amibroker@xxxxxxxxxxxxxxx
Date: Friday, April 18, 2003 09:09:43
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] Bollinger Band scan
I was wondering if anyone has a bollinger band scan that searches
for a tight band range -- I've seen a scan from the AFL library but
one of the parameters is that it looks for a tight range with a
recent penetration of one of the bands along with a recent widening
of the bands. I'd like a scan that finds a tight range and ignoring
the widening criteria; most of the candidates from this scan look
like great trades but the signal comes a little later than I would
like.
Here is the formula: Where does it state that it is looking for a
widening of the bands? I've been scratching my head all morning
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 AND V>275000;
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);
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