HELP NEEDED - $SPX as proxy for SP and ES Futures

[Jim Johnson <jejohn@xxxxxxxxx>]

I've only experiemnted a bit with this but found that for some of my
systems, esp those that rely on intra-day range expansion, that the SPX
doesn't play out.  Your approach seems to suggest the  Premium doesn't
matter.  To test it cheaply, download tick files from Omega or purchase
them.  Use SPX as Data2 and write you signals on it and your trades on
the SP futures contract.  Then reverse them. Then use each on on its
own.

If you do all that, pls publish the results.
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Subject:   HELP NEEDED - $SPX as proxy for SP and ES Futures

Currently, I am using the S&P500 index as a proxy for the SP and e-mini
futures in my tests of daytrading sys