Scenario Analysis (DIX-GEX): Today’s SPX within 22¢ of Forecast

How often did GEX abruptly contract between 50 and 100% while DIX held within a 0.40-0.45 range?  That scenario (above) predicted today’s SPX would close only 22¢ above its actual. (Odds 1.16)

Note: The key to these scenarios is identifying what is significant about changes in gamma exposure and dark pools’ simultaneous activity.  Query selection is critical.