Chi-squared distribution

Rare card · No. 54559

In probability theory and statistics, the χ 2 {\displaystyle \chi ^{2}} -distribution with k {\displaystyle k} degrees of freedom is the distribution of a sum of the squares of k {\displaystyle k} independent standard normal random variables. The chi-squared distribution χ k 2 {\displaystyle \chi _{k}^{2}} is a special case of the gamma distribution and the univariate Wishart distribution. Specifically if X ∼ χ k 2 {\displaystyle X\sim \chi _{k}^{2}} then X ∼ Gamma...

Read on Wikipedia · Image Geek3, CC BY 3.0