卡方分布
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| 后一修订版 | 前一修订版 | ||
| 卡方分布 [2023/04/11 08:06] – 创建 yunyuqu | 卡方分布 [2024/04/17 15:18] (当前版本) – zwz | ||
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| ====卡方分布==== | ====卡方分布==== | ||
| - | 1.定义：由自由度df决定的正偏态分布。 | + | ====Chi-square distribution==== |
| - | 2.特点： | + | ====1.定义(Denfinition)==== |
| - | ² | + | *由 自由度df决定的正偏态分布。 |
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| + | *A positively skewed distribution determined by the degrees of freedom (df). | ||
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| + | ---- | ||
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| + | ====2.特点(Characteristic)==== | ||
| + | * **数值**：X²都是正值。 | ||
| + | * **可加性**：几个X²的变量的和仍然服从卡方分布。 | ||
| + | * **形状**： | ||
| + | * ① 取决于类目数，而不是样本数。（df=C-1） | ||
| + | * ② 卡方分布呈现正偏态，右端无限延伸，不与基线相交。 | ||
| + | * ③ df越大，分布越趋向对称，越趋向正态分布。 | ||
| + | * **临界值**：df增加，临界值增加 | ||
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| + | * **Numerical value**: X² are positive. | ||
| + | * **Additivity**：The sum of several X² variables still obeys a chi-square distribution. | ||
| + | * **Shape**： | ||
| + | * ① Depends on the number of classes, not the number of samples.（df=C-1） | ||
| + | * ② The chi-square distribution exhibits a positive skewness with an infinite extension at the right end that does not intersect the baseline. | ||
| + | * ③ The larger df is, the more the distribution tends to be symmetric and normal. | ||
| + | * **Threshold value**：Increasing df results in an increase in the critical value. | ||
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| + | ---- | ||
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| + | ====3.例图（Example chart）==== | ||
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| + | {{: | ||
卡方分布.1681200379.txt.gz · 最后更改: 2023/04/11 08:06 由 yunyuqu