On Characterizing the Chi Square Distribution by the Student Law
由 Student 分布刻画卡方分布
It is known that if X 0, X 1 are independent random variables identically distributed according to the chi square distribution with n degrees of freedom then the random variable follows the Student distribution with n degrees of freedom. But the chi square distribution can not be characterized by this property, because there exist pairs X 0, X 1 of independent positive random variables identically distributed according to distributions differing from chi square, and for…