> 1)  "Book Balance" in JBT data format. Is it SUM(ASK SIZE)-SUM(BID SIZE)?
>
>
balance = 100 * (cumulativeBidSize - cumulativeAskSize) /
(cumulativeBidSize + cumulativeAskSize)
See MarketDepth.java for more specifics.



> 2)  "Volume" in JBT data format. In the data set, the volume is not an
> increasing function in the same same day and many zeros from time to time.
> Is it just a trade size at that time period?
>
>
The volume figures are reported for the elapsed second, not the cumulative
session volume.

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