I merged the HG contracts for the last year and found the intraday data looking strange periodically.
The reasons are the rollover dates as defined in NT7's contract rollover table. NT7 defines the rollover as a date appr. one week before expiration. But the real rollover regarding volume happens one month earlier for HG. And therefore I see periodically very low volume activity for one month.
Here is a comparison between the rollover dates defined by NT7 and the dates as identified by myself based on volume:
Month | NT7Rollover | myRollover
07-09 | 2009/05/25 | 2009/04/27
09-09 | 2009/07/27 | 2009/06/29
12-09 | 2009/09/21 | 2009/08/28
03-10 | 2009/12/28 | 2009/11/27
05-10 | 2010/03/22 | 2010/02/24
I am wondering if you could modify/improve your HG rollover schedule generally?
Regards
Ralph

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