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I don't understand historical 5-second bar volume


Charles
 

Hey,
I'm new to this group, so please have mercy on me.

I trying to use "reqHistoricalData" to get 5-second bar data.? I don't understand what the "bar.Volume" means.

For example, I have IQFeed.net and I downloaded all the trades for symbol "A" on Friday, February 26, 2021.
The IQFeed showed a total volume of?1,319,476.

I looked at finance.yahoo.com and they show a total volume for A to be?1,909,665.

To get the total volume for "A" from TWS, I added all the "bar.Volume" data. This gave me a total volume for the day of?8,992.

Does a "bar.Volume" of 3 mean 300 shares traded during that 5-second interval?

When I sum all the "bar.Volume" data for stock "A", why is the amount so low?

Charles

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