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>- Availability of updates (ie: how early can you get data each day)
Beware of the above issue. If a vendor rushes to get data to you, they
are not doing enough error-checking and are sending you incomplete
data. I discovered this through experience. Brokers are allowed to
report trades after the market closes, and are allowed to swap blocks
of stocks at closing prices after the market. Vendors who deliver
data later have these trades included.
-Neal.
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