我想建一个模型logistic regression model,预测大学新生的毕业率。变量hsgpa (high school GPA), gender 都显著。
goodness fit 结果并不好,Pearson statistic is 0.1025 and Deviance is only 0.0351.
想请问下大家,为什么 Pearson statistic, Deviance 两者差别这么大?谢谢大家, 以下是sas output.
Deviance and Pearson Goodness-of-Fit Statistics
Criterion Value DF Value/DF Pr > ChiSq
Deviance 414.3363 364 1.1383 0.0351
Pearson 398.5674 364 1.0950 0.1025
Number of unique profiles: 367
Note:The covariance matrix has been multiplied by the heterogeneity factor (Deviance / DF) 1.13829.
Model Fit Statistics
Criterion Intercept Only Intercept and Covariates
AIC 2515.367 2310.963
SC 2521.045 2327.998
-2 Log L 2513.367 2304.963
Testing Global Null Hypothesis: BETA=0
Test Chi-Square DF Pr > ChiSq
Likelihood Ratio 208.4041 2 <.0001
Score 196.6274 2 <.0001
Wald 180.8119 2 <.0001
Type 3 Analysis of Effects
Effect DF Wald Chi-Square Pr > ChiSq
GENDER 1 6.0637 0.0138
HSGPA 1 159.5118 <.0001


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