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Jan,
I guess this needs more explanation. The rule for
roll-over of the indices is:
Roll-over occurs on the Thursday before the second Friday of
expiration month.
December is an expiration month. So roll-over is
Thursday December 9, 2004. However, if the volume of the March contract
matched the volume of the continuous contract (and not the December contract) on
Wednesday, December 8, 2004 then your data feed made the March contract the
front month for the continuous contract on that date. You can check this
by looking at the price action during the day. If the prices of the
continuous contract match the prices of the March contract (and not the December
contract) then they rolled over the contract a day early. Not unheard
of.
Pete
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