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I suspect the reason for the differences is the starting date for the
calculations. Since the MACD uses two exponential moving averages the
start date must match. If you are using the formula call MACD() then
the calculation will be the same as the chart as long as the starting
date is the same. But, the built-in MACD matches Gerald Appel's
calculation exactly and a custom formula can not do that. In order to
maintain the mathematical integrity of the MACD as prescribed by Gerald
Appel, MetaStock does not allow the time periods in the MACD to be
changed. The MACD is actually the difference between 0.075 and 0.15
exponential moving averages. No exact time periods (using whole
numbers) correspond with these percentages. If you want to plot an
MACD-like indicator using moving averages other than the ones
recommended by Gerald Appel, use the Price Oscillator.
Equis Support
> -----Original Message-----
> From: Wolf Kettler [SMTP:wolf_1@xxxxxxx]
> Sent: Tuesday, July 29, 1997 8:01 AM
> To: MetaStock List (E-mail)
> Subject: RE: Very Serious, Very Urgent--MS Bug???
>
> Dan,
> >>Did you by any chance modify the formula after you created the
> exploration?<<
> :) No, I didn't.
>
> John,
> >>Check that the number of periods being loaded in the Explorer is the
> same
> as the number of periods being loaded in the charts.<<
> That's an interesting point that, indeed, I had not considered.
> However, I
> load "minimum periods" in my explorations and I have just carried out
> some
> more tests with a stoch exploration which uses the same basic
> settings, and
> for the stoch values everything agrees, so it should not matter. I
> have not
> checked any of the other indicators against my charts, but so far it
> looks as
> if the problem is only with MACD.
>
> Wolf
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