Neurointervention.
2009 Feb;4(1):6-7.
Statistical Note on the Survival Analysis
- Affiliations
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- 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.
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