Intraday volume

Hi!
is anyone can tell me-who is more accurate in counting volume from your expirience?
i got this for today:
my app:
amat-24.67M
nvls-9.62M
klac-11.73M

scottrade:
amat-26.55
nvls-8.90
klac-11.29

yahoo:
amat-32.32
nvls-10.86
klac-14.6

datek:
amat-33.064
nvls-10.92
klac-14.77

i can accept difference in 0.5M on stock with 10M average,
but difference between my app,scottrade and yahoo in 3M on klac-to much.
any idea-which one i should use?
thank you!
 
DATEK is the most accurate. Scottrade is always behind. I think they do not count pre-market trading. Yahoo is delayed. Datek volume is always accurate. (well, except on the days when their servers have problems, but then it is very obvious)
 
Originally posted by j_medved
DATEK is the most accurate. Scottrade is always behind. I think they do not count pre-market trading. Yahoo is delayed. Datek volume is always accurate. (well, except on the days when their servers have problems, but then it is very obvious)
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thank you Jerry!
 
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