Why am I seeing a volume discrepancy between my EOD and Time and Sales (T&S) data?
There can be differences in volumes due to inclusion/exclusion of trade quantities from different venues and trade types.
What is the significance of the trade sequence number?
The trade sequence number lists the order of records in the Time and Sales file. It does not correlate to the FIX sequence number. Each tradable product in the Time and Sales file has its own sequence number and every new file sent each day has a new set of sequence numbers.
What do the field headings mean?
Time and Sales headers display Commodity, Trade Date, Time and Price. For CME Globex Time and Sales, Quantity is added to the aforementioned headers.
Why is there no volume associated with RTH commodities?
RTH is an Open Outcry environment. Volume is not reported for any transaction. Only time and price are entered into the price reporting system by the market reporter.
What is sequence of record in these files?
These files are derived from FIX protocol. Therefore, the sequence number is the official record of sequence. A user should always sort by sequence number and not timestamp when using these files.
What does an “I” stand for?
“I” represents an Inserted price. A price may be inserted when there is a gap in the sequence of executed trades.
What does it mean for ETH ticks to have volume of 0?
An ETH tick with volume quantity of “0” indicates no trade was executed. This record is an example of an indicative price quote; that is, no trade occurred, but the market is “indicated”
What does the “X” or “C” stand for?
“X” represents a cancelled price and “C” represents a corrected price.
How can I make a chart using this data?
You must have software designed for charting to import the data files.