卡方拟合优度检验计算器
执行卡方拟合优度检验，判断观测频率与期望频率是否存在显著差异，输入数据即可获得检验统计量和p值。
Chi-square Contribution
0.5000
Deviation (O - E)-5.00
自由度4
Chi-square Contribution vs Observed Frequency
公式
Chi-Square Goodness of Fit
chi2 = Sum((O-E)^2/E)
Tests observed vs expected frequency distribution.
计算示例
O=45, E=50, k=5.
- 01chi2 = 25/50 = 0.5
- 02df = 4
常见问题
Min expected?
At least 5 per category.
Significant result?
Observed differs from expected.
Vs independence test?
Goodness of fit tests one variable; independence tests two.
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