The probable error of a correlation coefficient is not a thing which can be deduced from first principles, but must be found empirically.
相关系数的可能误差不是可以从第一原理推导出来的东西，而是必须通过经验找到的。
"The future belongs to those who believe in the beauty of their dreams."
眼睛同时看两样东西，就会看不明白；耳朵同时听两种声音，就会听不清楚。