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It used to be a problem with traders using AIQ and some downloaded from
DialData and others from Telescan. One had theoretical and the other the
printed values. It made a difference in whether there was a 95 Expert Buy
Rating or not.
bobr
----- Original Message -----
From: "Bob Fulks" <bfulks@xxxxxxxxxxxx>
To: "BobR" <bobrabcd@xxxxxxxxxxxxx>
Cc: <omega-list@xxxxxxxxxx>
Sent: Monday, April 09, 2001 5:17 PM
Subject: Re: Different Between Intraday and Daily Data?
> At 4:13 PM -0700 4/9/01, BobR wrote:
>
> >It looks like the old issue of theoretical DJIA vs actual. Your intraday
> >bars are the actual prices and the daily bars have the high and low as if
> >all components made their high and low at the same time.
>
> This appears to be the case. I went to the dowjones.com website and
> they give values consistent with the intraday values.
>
> It is strange that the values given in the charts in Dow Jones
> publications such as Barrons use the theoretical.
>
> I am told that Bridge reports the actual, not the theoretical.
> Apparently some vendors report both with different symbols but Dial
> Data does not appear to do so.
>
> I once built an indicator once in TradeStation to calculate it on
> one-minute bars from the 30 components, hoping to get the jump on the
> calculated value, and the numbers were the same as the calculated
> value and less than a few seconds faster. So I know the intraday
> value is correct as of the price on each bar of the component.
>
> I wonder who would even care about the theoretical. Perhaps it is a
> holdover from the dark ages, (before computers), when it was probably
> easier to calculate the high and low of the day from the highs and
> lows of the components, since there would have been no practical way
> to calculate it every few seconds...
>
> Thanks for all the public and private responses.
>
> Bob Fulks
>
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