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Ah
ha... Williams' A/D is a bit different. Keep in mind that the value
of the A/D line at any point will depend on the exact day you start the
calculation. You may never match the exact values for A/D. You
should, however, be able to match the change in the value each day.
Let me know if that needs more explanation. Here is the formuila for
Williams' A/D:
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size=2>
To calculate Williams' Accumulation/Distribution indicator,
first determine the True Range High ("TRH") and True Range Low ("TRL").
<IMG height=44
src="" width=385>
Today's accumulation/distribution is then determined by
comparing today's closing price to yesterday's closing price.
If today's close is greater than yesterday's close:
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src="" width=227>
If today's close is less than yesterday's close:
<IMG height=20
src="" width=231>
If today's close is equal to yesterday's close:
<IMG height=20
src="" width=110>
The Williams' Accumulation/Distribution indicator is a
cummulative total of these daily values.
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src=""
width=368>
<BLOCKQUOTE
>
<FONT face="Times New Roman"
size=2>-----Original Message-----From: sloughbridge
[mailto:sloughbridge@xxxxxxxxx]Sent: Wednesday, August 13, 2003
2:36 PMTo: amibroker@xxxxxxxxxxxxxxxSubject: [amibroker]
Re: AFL -- ACCDIST--- In amibroker@xxxxxxxxxxxxxxx,
"Chuck Rademacher" <chuck_rademacher@x> wrote:> Try
this:> > Thanks, Chuck. That doesn't match the
results of the internal formula either. I have seen quite a few
different versions of what passes for Williams Accumulation-Distribution
lately. The issue only comes up as I am trying to normalize some of
the indicators I use, and to do that I want to divide the Nperiod sum of
AccDist by Nperiod Volume, and to be able to vary the period. In
playing with the formulae, I discovered that the AB internal formula gives
quite different numbers than I am able to get. I'd really like to
know the internal formula for AccDist so I can understand what I'm doing
wrong.Send
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