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Strategies & Market Trends : Technical Analysis - Beginners

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To: Chris G. who wrote (7346)	12/28/1997 5:19:00 PM
From: Craig DeHaan	Read Replies (1) of 12039

RE: OBV problem I mentioned a couple days ago that calculation of OBV starts with a value of 0 for the oldest day (on the screen?), the total volume for an up day is added to the OBV, while the total volume for a down day is subtracted from the OBV. The volume for an unchanged day is ignored. There is a pronounced shift in origin within Q+ display screen when you zoom in and out specifying screen periods, but I didn't realized that MS has it too. But is it a problem? Think about how the calculation is determined and since in accumulates from some starting point where should that point be: the earliest data in the database or the first point on the left of the screen? The OBV>40SMA should be a wash whereever the starting point is assuming you're viewing at least 2X that many days.

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