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Probably because your daily bar is created from all-session
pricing, and your intraday is pit-session only.
Scheier
Bob Fulks wrote:
> Does anyone know why the high and low values on a daily bar of the
> DJIA are so different from those you calculate from intraday bars?
>
> For example, on the attached GIF, the red and blue traces are the
> high and low respectively, from the previous daily bar. The gray
> lines are the values derived from the intraday bars for the previous
> day. The range of the intraday bars is much less than that of the
> daily bars.
>
> My numbers for 3/6/01 from two sources:
>
> Open High Low Close
>
> Daily 10570.17 10759.40 10508.43 10591.22 Yahoo
> Daily 10570.17 10759.40 10507.21 10591.22 Dial Data
>
> Intraday 10578.3 10690.6 10576.0 10589.8 BMI
> Intraday 10690.71 10576.05 QuoteCom
>
> Diff 8.13 68.80 68.79 1.42
>
> The open and close are pretty close and I understand that they make
> adjustment to those. But why should the high and low be so different?
>
> Thanks.
>
> Bob Fulks
>
> -------------------------------------------------------------------------
> Name: DJIA3.gif
> DJIA3.gif Type: GIF Image (image/gif)
> Encoding: base64
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