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Tom Upton
2011-05-20 09:02:01
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I've overlaid the OBV indicator and noticed that at times the OBV value will suddenly change from large positive to large negative, in a way that does not obviously relate to the actual OBV calculation (ie value change is far larger than the daily volume). This occurs with both OBV indicators in the library. When I use OBV-2, I see this when using "close" as one of the arguments. If I change this to "open" the OBV values change more regularly with volume. This looks like a bug, but I may be doing something wrong. Can someone comment? An example would be plotting OBV on AMAT.t
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QuantShare
2011-05-20 14:09:10
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Hi,
It is probably because your "OBV" indicator is using the default scale.
Because OBV returns high values, it must have its own scale (when used as an overlay indicator). Update the indicator and set "StyleOwnScale" style.
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Tom Upton
2011-05-22 07:42:29
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I've been using StyleOwnScale throughout. Have you tried my example case (charting Applied Materials, going back to 2008-2009)? There are other cases as well where this sign flip occurs.
Thanks.
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QuantShare
2011-05-23 05:29:31
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Hi Tom,
I have checked AMAT and located the problem. It occurs because the volume sum exceeds the double variable type limit.
We will make the appropriate changes. In the meantime, you can type the following formula:
a = Obv(close, volume/1000);
Thank you for reporting this.
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QuantShare
2011-05-24 04:08:12
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The correction will be available in the next release. (in few weeks)
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Tom Upton
2011-11-12 13:17:35
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Just noticed that I still get this error on OBV. Look at chart of Intel over last 2-3 years. Is there an update?
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QuantShare
2011-11-13 07:34:43
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Best Answer
Please forget my first response.
The problem is caused because OBV uses its own scale. You have to set the scale of OBV to "StyleSymbolNone".
You can change the scale of other studies (in the same pane) to "StyleOwnScale".
Let me know if this works for you.
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