摘要
目的 :本文介绍了识别 COX模型中强影响点的诊断方法。方法 :利用 COX回归模型的两种残差和经验影响函数识别 COX模型的强影响点 ,并通过实例比较两种方法的优劣。结果 :实例显示对影响函数绝对值较大的点 ,如明显偏离其它数据点 ,可诊断为强影响点。结论 :影响函数可有效地诊断 COX模型的强影响点 ,而残差分析效果平平 ,建议实际应用中采用前者。
Objective:This paper introduces diagnostic methods of identifying the influence points of COX model.Method:Apply two kinds of residual theory and influence of COX model to diagnosing the influence point of COX model,and compares residual analysis to influence analysis.Result:The analysis of example data shows that the points are considered as influence points,whose influence function absolute value is larger than the others.Conclusion:Influence function may identify effectively the influential point,while the effect of residual analysis is not well.So we suggest using the former in practical application.
出处
《现代预防医学》
CAS
2000年第1期48-50,共3页
Modern Preventive Medicine
关键词
COX模型
回归诊断
影响函数
残差
COX model
Regression diagnostic
Influence function
Residual
