Try looking at all the data, not just Thursday. Please report back on your findings.
For all days or every weekday? I can run the data after the close later tonight.
I'm only looking at the difference between the cash close (16:00 EST) and cash open (09:30 EST) and not actual overnight data.
If you're saying that stock indices simply rise overnight 'most of the time' and is 'up' at some point in time during ETH, I don't have the data set up to check out that right now. Maybe someone else could assist. Would be interesting to see those numbers also.