卡方匹配度检验

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--- 卡方匹配度检验 [2023/04/13 15:16] – zhangruihao
+++ 卡方匹配度检验 [2024/04/16 03:40] (当前版本) – aiyuheng
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-**卡方匹配度(拟合优度)检验**
+**卡方匹配度(拟合优度)检验（Chi-square match (goodness of fit) test）**
 ----
   *卡方可以用来检验频率的**观测分布和理论分布之间的拟合优度**。
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   ***卡方检验的计算步骤：**①提出假设；②根据虚无假设𝐻o，选择相应的统计模型；③确定显著性水平α（α确定后，否定域也随之确定）；④基于𝐻o所设定的统计模型，计算检验统计量的值；⑤做出决策。
+  *** Chi-square match (goodness of fit) test **
+----
+The chi square can be used to test the goodness of fit between the observed and theoretical distributions of frequency.
+*** Definition formula: ** statistic 𝜒^2=Σ [(FO-Fe)^2/fe] (observed number fo, expected number fe=pn), degrees of freedom df=C-1 (C: number of class objects).
+*** Test limitations ** : ① Sensitive to sample size (significant results can be obtained when sample size is large); The causal relationship cannot be determined.
+* * * chi-square test the effect of Cramer 's V: V * * = {𝜒 ^ 2 / (n * min (r - c - 1, 1)]} ^ 1/2
+*** Calculation steps of Chi-square test: **① Put forward the hypothesis; ② According to the null hypothesis 𝐻o, select the corresponding statistical model; (3) The significance level α is determined (after α is determined, the negative domain is also determined); ④ The values of the test statistics are calculated based on the statistical model set by 𝐻o; ⑤ Make decisions.

卡方匹配度检验.1681399010.txt.gz · 最后更改: 2023/04/13 15:16 由 zhangruihao