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I have recently received data for "SPY" from some friends and noticed that
the values are roughly one-tenth the value of the S&P 500 cash index. At
the AMEX web site, "SPY" is described as the "SPYDER" trading vehicle and
the value shown there is also roughly one-tenth of the cash index. (I am
familiar with the SPYDER.)
What puzzles me is that on BMI (and also Signal, which I formerly used),
"SPY" is described as "S&P 500 Stock Index TRUE" and its value is exactly
the same as the value of SPX. It comes from the CME and it updates much
more frequently than SPX - for example, daily tick counts run just above
1400 for SPX and above 1600 for SPY.
How come what others are receiving for SPY is different from what I am
receiving? On Signal is it possibly that there are two different symbols,
"SPY" and "$SPY"?
Carroll Slemaker
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