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Neurointervention 2009;4(1):6-7.
Statistical Note on the Survival Analysis.
Jae Kyun Kim, Dae Chul Suh
1Department of Radiology, Seoul Veterans Hospital, Korea. dcsuh@amc.seoul.kr
2Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan, College of Medicine, Korea.
Abstract
This brief note describes the principles of survival analysis. Survival analysis is method for studying the time between entry to a study and a subsequent event and is used frequently in neurointervention studies. Kaplan-Meier estimator is nonparametric method for estimating the survival curve and log rank test is used for comparing between exposure and non-exposure groups. Proportional hazards model, a semi-parametric regression model specifically developed for censored data, is used when there are many exposure variables.
Key Words: Survival analysis; Statistical methods; Kaplan-Meier; Cox regression
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