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<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Bob Jagow
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, February 11, 2004 9:17
PM
Subject: RE: [amibroker] Sigma
Bands
I
doubt that Clyde Lee uses a polynomial, Bill.
<FONT face=Arial color=#0000ff
size=2>Perhaps a Fourier series, but I'd be inclined to try cubic
splines
<FONT color=#0000ff
size=2>
<FONT face=Arial color=#800000
size=2>I think you are mixing up someone else with respect to
Lee. As for cubic spline, I don't know if that's enough to replicate the
CMA with sufficient accuracy. I know that one of the guys working with
Ensign was working on 4th order, but I don't know where that ended up. I
think eSignal permits one to choose the order, but am not sure how a user
would decide which one makes sense. Maybe by comparision with a
CMA.
<SPAN
class=685400902-12022004><FONT face=Arial color=#0000ff
size=2>Bob
<FONT face=Tahoma
size=2>-----Original Message-----From: wavemechanic
[mailto:wd78@xxxxxxxxxxxx]Sent: Wednesday, February 11, 2004 4:40
PMTo: <A
href="">amibroker@xxxxxxxxxxxxxxxSubject:
Re: [amibroker] Sigma Bands
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Bob
Jagow
To: <A
title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, February 11, 2004
6:16 PM
Subject: RE: [amibroker] Sigma
Bands
<SPAN
class=619405021-11022004>[Didn't show yet so am
resending.]
<SPAN
class=619405021-11022004>
<SPAN
class=619405021-11022004>The example was for 250 days,
Steve.
<SPAN
class=619405021-11022004>-----
Note: You have probably noticed
that the charts for sigma bands and signal bands are very similar. This is
because signal bands are actually sigma bands of shorter duration. They
are based on a preset control parameter. For signal bands the control
parameter is 21 periods, for sigma bands the parameter is set to
250 periods. So for daily data signal bands are based on 21 days,
or one trading month, and sigma bands are based on 250 days, or one
trading year.
<FONT face=Arial color=#0000ff
size=2>----
<FONT face=Arial color=#0000ff
size=2>Based on a quick look at chart 9, I'd agree that the sigma bands
must be based on the last value of stddev from a extended centered 250SMA.
[Note that the use Hurst CSMAs in much of their
work.
<FONT face=Arial color=#0000ff
size=2>Maybe we can get Dimitri to extrapolate the SMA
8>)
<FONT color=#0000ff
size=2>
It
is my understanding that this is why multi-order polynomials are used -
i.e., to extrapolate the CMA.
<FONT face=Arial color=#0000ff
size=2>
<FONT face=Arial color=#0000ff
size=2>Bob
<FONT face=Tahoma
size=2>-----Original Message-----From: Steve Almond
[mailto:steve2@xxxxxxxxxxxxxxxxxxxx]Sent: Wednesday, February
11, 2004 1:35 PMTo:
amibroker@xxxxxxxxxxxxxxxSubject: Re: [amibroker] Sigma
Bands
sjaak,
This is close, but not the same. I read (somewhere, whilst
searching Sigma bands) that the 'trend' may be a centred moving average.
That would seem to make more sense, but I don't know what happens at the
end when the centred MA finishes. Send
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