卡方分布的期望和方差

Expectation and Variance of Chi-Squared Distribution

Posted by J Leaves on September 28, 2019

证明

proof-part-1

proof-part-2

Reference

转载自 自由度为n的卡方分布χ²(n)的期望等于n、方差等于2n的证明 - 征丶舤 - CSDN博客