here's my take...
stocks in an index close make up the closing price of that index...
so it is from the prior nights close that i base my envelope...both sides of the opening...with the percentage change of the future...
if the component stocks of the index make up its value then they should move in tandem with the futures...
if they don't... then i have a trade...
if the stock moves from its "component value" due to news or earnings it is avoided by blocking orders on that stock on that day...
i hope this doesn't sound too esoteric but it is actually pretty plain vanilla on further observation...
stocks in an index close make up the closing price of that index...
so it is from the prior nights close that i base my envelope...both sides of the opening...with the percentage change of the future...
if the component stocks of the index make up its value then they should move in tandem with the futures...
if they don't... then i have a trade...
if the stock moves from its "component value" due to news or earnings it is avoided by blocking orders on that stock on that day...
i hope this doesn't sound too esoteric but it is actually pretty plain vanilla on further observation...