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You're talking about a rate of change of the study, with a period of 1 (since OBV is a cumulative indicator, the difference between two values over a period of time is the same as the change between them over that time. So the one-bar OBV is the ROC for a period of 1.)
In Sierra Chart (and other platforms usually), you can feed the output of one study into another. So you could add rate of change to your chart and then make its input OBV, for instance.
(In SC, for some reason they have a Rate of Change Oscillator Type I and also Type II, and both of them look complicated with a lot of bells and whistles. Fortunately, they have a Momentum Oscillator that is a simple, straightforward Rate of Change, so I'll use that to illustrate.
Here's how to do it:
This produces this chart:
Since you've now got an oscillator of a cumulative line (OBV), you might want to play with the period to see if you can see anything else you like. Here's what you get with a period length of 5, which means it's showing the change over the past 5 bars instead of bar-by-bar:
Bob.
When one door closes, another opens.
-- Cervantes, Don Quixote
