The volume to average volume comparison becomes more accurate as the day goes on. The TAAV calc evens that out by time-adjusting the ratio. For example, if the stock normally trades 200,000 shares in 30 mins and it's traded 400,000 shares by 10 AM, that's difficult to perceive using the naked eye or by comparing volume to average volume, but the TAAV value would show up as a 2 - or double the normal volume for the timeframe.
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