Chi-square distribution

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This is a distribution mainly used in statistics. The Chi-square distribution/Loi du Khi-deux noted as $\chi ^{2}(k)$ or $\chi _{k}^{2}$ is taking a degree a freedom (degré de liberté) $k$.

The Chi-square distribution is a sum of $k$ variables following a standard distribution.

You may read the wiki or the associated page in the statistic course.