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[amibroker] strange "cum(volume) result compared to Excel.



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Hi,

Has anyone seen this strange results from cum(volume) as it compared 
to same formula in Excel spread sheet.  I have following lines in 
Auto-Analysis.  

AddColumn(Volume ,"Volume",1);
AddColumn(Cum(volume) ,"CumVol",1);
filter = 1;

"Explore" on one stock; copy result to an Excel sheet.  insert 
cumulative formula for volume and the results are different in some 
lines moving forward.

I would expect I get no 1's and 10's column in AB "cum" function 
because volume datas are reported with 100's as smallest size.  
However I see some 2,4,6,8 in the least significant column.  Has 
anyone seen this before and have an explaination for it?
TIA




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