Variance

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Variance is a statistical measure that describes how spread-out or dispersed a data set is around its mean or expected value. It measures the average deviation of each data point from the mean.

The variance of a set of $n$ data points, denoted by $\text{Var}(X)$ or $\sigma^2$ , is calculated by first calculating the mean or expected value of the data set ( $\mu$ ), and then calculating the sum of the squared differences between each data point and the mean, divided by :

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Tian Li et al. Federated Learning Challenges, Methods, and Future Directions Interaction Effect Weak Law of Large Number 230307 Cauchy Standard Normal

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