Is that really valid? Is that the result you'd get if you compared posting the same article at different times or is it possible that better articles get submitted at certain times?
Yeah, it's a good point, there's no ruling that out, although the cycles would need some explaining
I noticed that if you plot just the counts of submissions each hour, it shows a very clear cyclic pattern, but _slightly_offset_ in time from the scores data
So the peaks in submission scores tend to coincide with the point at which submissions-per-hour are really beginning to accelerate for that day