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This has been discussed several times before. Back adjusted data changes
the volumes so the adjusted price * adjusted volume still gives correct
answers. Volumes can get so large they exceed 32 bit resolution and
"roll-over" to a negative value. You can change how volume is handled to
get Volume/1000 or whatever to avoid this.
Unfortunately, I do not remember the variable to adjust.
--
Terry
-----Original Message-----
From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On
Behalf Of yokehg
Sent: Sunday, April 23, 2006 07:16
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] Negative volume on downloaded data from Yahoo
I just notice that the negative volume on downloaded historical data
from Yahoo! is due to overflow data in Amibroker. (It's not Yahoo!
mistake which I've been thought so far. I'm sorry Yahoo! :-) )
So I convert the negative volume data, simply by using this formula to
my favourit volume indicator:
2*2147483647+V
and it works as I expect.
However, lately on new version of Amibroker (or Amiquote?), it looks
like that it has been 'fixed' (I'm not sure which version it has been
started), so that the volume that is greater than 2147483647 is
interpreted as 2147483647, which I don't think it is not a good idea.
Hope Amibroker will rectify this on next version.
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