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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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