Abstract
Introduction 285 Features of Survival Data 285 Survival Function 286 Kaplan-Meier Estimator and Product Limit Estimators 2 87 Calculation and Formula for an Estimate 287 Calculation of Variance 288 Comparing Two Survival Functions 2 88 Comparing Two Survival Functions at a Given Time Point 288 Comparing Two Survival Functions Using the Whole Curve: Logrank Test 289 Example 1: Chronic Active Hepatitis Study 289 Stratified Logrank Test 290 Proportional Hazards Model 2 91 Calculation and Formulas 291 Example 2: Study of Melanoma Patients 291 Common Mistakes 292 Conclusion 292 Summary Questions 292 References 293
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