It seems like among the top 4, Berkeley has the highest citation/publication ratio, which indicates they publish less (due to size or just pub frequency), but w

It seems like among the top 4, Berkeley has the highest citation/publication ratio, which indicates they publish less (due to size or just pub frequency), but with more meaningful stuff on average. I wonder if this is related to the laid-back culture of Berkeley that students don't have pressure to "publish". Disclaimer: I am becoming a graduate student at Berkeley soon.