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Anthony, thanks for the formula. I like it! I was able to figure
out the other formula, luckily today is a slow day at the office and
I've had time to play around with the AFL.
--- In amibroker@xxxxxxxxxxxxxxx, "Anthony Faragasso" <ajf1111@xxxx>
wrote:
> 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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