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If all you need are tighter Bollinger Bands, you dont need this formula.
When you drag the BB indicator button over to the price chart a window opens
up that allows you to change the parameters, including the number of std
dev. I always felt that 2.0 standard deviations is too high, and I change
it to 1.5 or something else that may be more suitable.
Lionel
-----Original Message-----
From: Bill Saxon <bsaxon@xxxxxxxxxxxxxxx>
To: metastock@xxxxxxxxxxxxx <metastock@xxxxxxxxxxxxx>
Date: Wednesday, December 16, 1998 8:53 AM
Subject: Re: Bollinger Bands
Do these two sets of formulas give the same Indicator??
-----Original Message-----
From: Christian Baude <BAUDECB@xxxxxxxxxxxxx>
To: metastock@xxxxxxxxxxxxx <metastock@xxxxxxxxxxxxx>
Date: Monday, December 07, 1998 12:40 AM
Subject: Re: Bollinger Bands
>Hot off the Equis Web Page:
>
>Better Bollinger Bands - Dennis McNicholl, 1998 October Futures
>Magazine
>
>Tighter Bollinger Bands when markets are trending.
>
>pds:=Input("Periods",2,200,20);
>sd:=Input("Standard Deviations",.01,10,2);
>alpha:=2/(pds+1);
>mt:=alpha*C+(1-alpha)*(If(Cum(1)<pds,C,PREV));
>ut:=alpha*mt+(1-alpha)*(If(Cum(1)<pds,C,PREV));
>dt:=((2-alpha)*mt-ut)/(1-alpha);
>mt2:=alpha*Abs(C-dt)+(1-alpha)*PREV;
>ut2:=alpha*mt2+(1-alpha)*PREV;
>dt2:=((2-alpha)*mt2-ut2)/(1-alpha);
>but:=dt+sd*dt2;
>blt:=dt-sd*dt2;
>dt;
>but;
>blt
>
>-= Chris ß =-
>Using MetaStock 6.5 | FastTrack | FastRUBE | FastTools | TC2000
>
>
>On Sun, 6 Dec 1998 21:20:41 -0600, you wrote:
>
>>In the Oct issue of "Futures" there is an article written by Dennis
>>McNicholl called "Better Bollinger Bands". In his article he
>>describes how in a trending market the center band of the B.B.
>>will shift away from the "mean" value of the price, and that the
>>two outer bands will shift outward to such an extent that the
>>envelope loses its utility as a volatility gauge (these are his
>>words... not mine).
>>
>>As usual "Futures" only posted the TradeStation code, so this is
>>my conversion from it. He called the Indicator "Denvelope", and
>>it runs the bands much closer.....
>>similar to "Standard Error Bands".
>>
>>{Denvelope, Better Bollinger Bands}
>>Lb:=Input("Look-Back Period ?",3,100,20);
>>De:=Input("Band Deviation ?",.5,3,2);
>>Alp:=2/(Lb+1);
>>Mt:=Alp*CLOSE+(1-Alp)*PREV;
>>Ut:=Alp*Mt+(1-Alp)*PREV;
>>Dt:=((2-Alp)*Mt-Ut)/(1-Alp);
>>mt2:=Alp*Abs(C-Dt)+(1-Alp)*PREV;
>>ut2:=Alp*mt2+(1-alp)*PREV;
>>dt2:=((2-Alp)*mt2-ut2)/(1-Alp);
>>But:=Dt+de*dt2;
>>Blt:=Dt-de*dt2;
>>But;
>>Dt;
>>Blt;
>> Adam Hefner.
>> e-mail: VonHef@xxxxxxxxxx
>
>
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