The QQQ might have only a small visibile statistical ramp (you averaged all the period, take only the period when the 3:55 is higher than the 3:30 period and see what average you get), I would be surprised that if you take only that set you get less than 1% average gain for those 25 minutes. By the way, my reversal dyslexia caused me to report my last sale of the bu$$ wrongly, it was at $19.98 not $19.89, the gain was correctly cited...