GraphPad Statistics Guide

Q&A: Survival analysis

Q&A: Survival analysis

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Q&A: Survival analysis

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How does Prism compute the confidence intervals of the survival percentages?
Can Prism compute the mean (rather than median) survival time?

Can Prism create a survival curve when you already know the percent survival at each time?

What determines how low a Kaplan-Meier survival curve ends up at late time points?
Why does Prism tell me that median survival is undefined?
Can Prism compute confidence bands as well as confidence intervals of survival curves?
How does Prism deal with deaths at time zero?
How is the percentage survival computed?

Reference

David Machin, Yin Bun Cheung, Mahesh Parmar, Survival Analysis: A Practical Approach, 2nd edition, IBSN:0470870400.