Originally Posted by
coolhand
NYUD is a method of keeping track of volume by subtracting down volume from up volume; in this case it's on the NYSE. The net result is a number that is either above the zero line (more up volume than down volume) or below the zero line (more down volume than up volume). In the first 60-90 minutes of the trading day, the majority of days it sets the tone for what volume is going to do for the remainder of the session and is extremely reluctant to change. Once the direction has been established for the day, there is often a huge volume burst in the final few minutes of trading which 'finalizes' that trend for the day. Let's see how it ends today. At the moment, the S&P 500 is about 1 point from closing at a fresh all-time high.
Also, I do not think the apparent spike in NYUD is accurate today. It's likely got some corrupt data. It should get corrected sometime after the close.
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