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The American Statistician Volume 63, 2009 - Issue 1
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Statistical Computing and Software Reviews

The Mean, Median, and Confidence Intervals of the Kaplan-Meier Survival Estimate—Computations and Applications

Chris Barker Chris Barker, Ph.D. is a statistical consultant to the pharmaceutical industry in the San Francisco Bay Area . The author appreciates the help of several colleagues in preparing some calculations and answering questions about the software packages, Ted Karrison, (U. Chicago), Andy Bogart (U. Washington), Jon Peck (SPSS Inc.), Terry Therneau (Mayo Clinic), Paul Savarese (SAS Institute). The author is responsible for any errors in the manuscript.
Pages 78-80 | Published online: 01 Jan 2012
 
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Abstract

This short note points out estimators of the mean, median, and the associated confidence intervals of the Kaplan-Meier product limit estimate. Some uses of the estimator of the mean are described. In addition, differences among popular software packages in the calculation of both the mean and median and associated confidence intervals are demonstrated and are due to default settings in the software. Simple examples of the calculations are provided using S-Plus, R, SAS, Stata, and SPSS.

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