I use ABS( ) to
convert the negative number into a positive one:
MyVol =
ABS(V);
Plot(MyVol,”Volume”…….
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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