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 novel is the one bright book of life. Books are not life. They are only tremulations on the ether.
I don't believe in pure art.