Analysis of Variance

metrics

方差分析（ANOVA）This technique allows us to compare 3 (usually 3) or more populations of interval data. And it is extremely powerful.

It can be considered as an extension of the Student’s t-test

Confidence and Significance Level

$\overline{\overline{x}}$ is the grand mean. $\overline{\overline{x}}=\frac{{\sum }_{j=1}^k{\sum }_{i=1}^{n_j}{x}_{ij}}{n}$

---

It can be divided by One-Way Analysis of Variance and Two-Factor Analysis of Variance