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<<Since the scans and the chart would/should be using the same algorithm,
they should be identical. Since they are not, there is a defect in the
Quotes-Plus program>> is wrong, Lionel.
The chart loads all available data but the scan won't use it all unless
you have daystoload = 2200;
Don't want to get into algorithm polemics, thanks.
>
At 09:59 AM 11/24/98 -0600, you wrote:
>Bob:
>
>Speaking in general terms: no 2 algorithms will give the same answer. Back
>in the '60s or early '70s I saw a comparison of algorithms and computers.
>The author took 3 equations in 3 unknowns (x, y , and z) and solved them
>using different algorithms on the same computer and the same algorithms on
>different computers. I dont remember the exact numbers, but some of the
>results were off by as much as 50%, some were quite close. The author used
>x = y = z = 1
>
>Since the scans and the chart would/should be using the same algorithm, they
>should be identical. Since they are not, there is a defect in the
>Quotes-Plus program.
>
>The macd uses exponential moving averages. The value of the moving averages
>will depend on how much data is used. If you are using more than about 5
>times the long moving average, about 200 days, the differences should be
>small enough to ignore.
>
>Lionel Issen
>-----Original Message-----
>From: Bob Jagow <bjagow@xxxxxxx>
>To: metastock@xxxxxxxxxxxxx <metastock@xxxxxxxxxxxxx>
>Date: Tuesday, November 24, 1998 1:57 AM
>Subject: Re: QP2 / metastock calculation differences
>
>
>>Should be identical, Ed, once you base both of them on the same # of days.
>>QP2 loads all available data.
>>
>>
>>At 10:47 PM 11/23/98 -0500, you wrote:
>>>To all,
>>>I am only posting to this board because so many here are using QP2 for
>their
>>>data supply. I have noticed a calculation problem which I would like
>>>someone to verify before I contact QP2. This has to do with the MACD
>>>calculations. For example:
>>>
>>>Stock Symbol: ALLE
>>>Metastock: MACD (0) = -0.1991, MACDsignal(0) = -0.2496
>>> MACD (-1) = -0.2581, MACDsignal(-1) = -0.2622
>>>
>>>QPChart: MACD (0) = -0.2084, MACDsignal(0) = -0.2624
>>> MACD (-1) = -0.2712, MACDsignal(-1) = -0.2759
>>>
>>>QPScan: MACD (0) = -0.1946, MACDsignal(0) = -0.2426
>>> MACD (-1) = -0.2563, MACDsignal(-1) = -0.2546
>>>
>>> My reason for the concern is the crossover signal date. In this case the
>>>signal is triggered in the QPScan as of today when the QPchart and
>Metastock
>>>has the signal triggered at least one or more days before. Can anyone
>>>verify these numbers and suggest if there is a problem or not? I don't
>want
>>>to alarm QP if not needed.
>>>
>>>Secondly, why are all the numbers not exact? The calculation is not that
>>>complicated and all software is using the same data.
>>>
>>>thanks in advance,
>>>
>>>
>>>
>>
>>Bob Jagow
>>bjagow@xxxxxxx
>>
>
>
Bob Jagow
bjagow@xxxxxxx
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