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1.645 = 95% ... 1.2815 = 90% ... 1 = 84.13% , .8417 = 80%
.6745 = 75% , .5245 = 70% , .3854 = 65% , .2534 = 60%
.1256 = 55% , .0251 = 51% , .0001 = 50%
-------Original Message-------
From: equismetastock@xxxxxxxxxxxxxxx
Date: Monday, April 07, 2003 08:56:16
To: equismetastock@xxxxxxxxxxxxxxx
Subject: [EquisMetaStock Group] Re: Bollinger Bands
HI Roy & Chuck, thanks for the replies, you're right, that wasn't the
problem,my fault- I didn't explain it properly .. the problem is not how to
make a BB formula but how to put an exact Stdev in the fomula and know what
it will do.
say I want a Bollinger Band to contain 90% of price action, is this
2Stdev(no),
1.883 Stdev , don't know ?
if I had the formula how it's constructed, I could tailor a BB to suit, by
trial & error, and know that the result is statictically accurate( i hope?)
i think from memory 1Stdev is about 67%, 2Stdev about 96% and 3Stdev about
99%, but
the old memory isn't as good as it was !
Roy, i didn't think to check the help file first, sorry, i'll do so tonight.
I hope this explanation is better.
thanks keith
----- Original Message -----
From: Chuck Rademacher
To: equismetastock@xxxxxxxxxxxxxxx
Sent: Sunday, April 06, 2003 4:11 PM
Subject: RE: [EquisMetaStock Group] Re: Bollinger Bands
Roy...
Some times it's very difficult to ascertain the real question. That's why
I phrased my reply as a question. I'm sure that you already know how to
use the built-in functions as well as how to calculate them yourself.
I have read the original email several times and there is yet another answer
that we both could have missed. If you take the original question
literally, the answer would be something like:
Stdev(bbandtop( close, 10, S, 2 ),10)
But, somehow, I don't think that is what is wanted either.
So... Keith... I hope that one of us has answered your question. If not, we
are all too happy to help once we understand what it is that you want to do.
-----Original Message-----
From: Roy Larsen [mailto:rlarsen@xxxxxxxxxxxxxx]
Sent: Sunday, April 06, 2003 12:53 AM
To: equismetastock@xxxxxxxxxxxxxxx
Subject: Re: [EquisMetaStock Group] Re: Bollinger Bands
Chuck
The question I read was about "how to calculate the Stdev of Bollinger
Bands". Having been through the process of needing and working out the
underlying calculation, as opposed to the canned version syntax, I made the
possibly wrong assumption that Keith also wanted the same information. I
guess it depends on what question Keith was really asking.
Roy
----- Original Message -----
From: "Chuck Rademacher" <chuck_rademacher@xxxxxxxxxx>
To: <equismetastock@xxxxxxxxxxxxxxx>
Sent: Sunday, April 06, 2003 5:39 PM
Subject: RE: [EquisMetaStock Group] Re: Bollinger Bands
> Am I missing something here? Why would you simply say:
>
> Stdev(Close,10);
> -----Original Message-----
> From: Roy Larsen [mailto:rlarsen@xxxxxxxxxxxxxx]
> Sent: Sunday, April 06, 2003 12:32 AM
> To: equismetastock@xxxxxxxxxxxxxxx
> Subject: Re: [EquisMetaStock Group] Re: Bollinger Bands
>
>
> Keith
>
> Here's a formula for a 10 period Standard Deviation. It's not perfect
but
> it's the best I can come up with for the moment. You'll need to adapt
for
> your own needs.
>
> {Standard Deviation 10 periods}
> M:=Mov(C,10,S);
> X:=Power(M-C,2)+Power(M-Ref(C,-1),2)+
> Power(M-Ref(C,-2),2)+Power(M-Ref(C,-3),2)+
> Power(M-Ref(C,-4),2)+Power(M-Ref(C,-5),2)+
> Power(M-Ref(C,-6),2)+Power(M-Ref(C,-7),2)+
> Power(M-Ref(C,-8),2)+Power(M-Ref(C,-9),2);
> Y:=Sqrt(X/10); Y;
>
> Roy
>
> ----- Original Message -----
> From: "keith" <janus36@xxxxxxxxxx>
> To: <equismetastock@xxxxxxxxxxxxxxx>
> Sent: Saturday, April 05, 2003 7:14 PM
> Subject: [EquisMetaStock Group] Re: Bollinger Bands
>
>
> could some learned member explain to me how to calculate the Stdev of
> Bollinger Bands please.
> from memory, i think 2 stdev is about 96% and 3 stdev is about 98-99% of
> the
> range of the set parameter. does anyone know the formula to calculate
it
> ?
>
> thanks keith
>
>
>
>
>
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