This is a test version of Biostars. For the public version, visit https://www.biostars.org.
More expected events than group size in survival analysis

Hi, I'm doing survival analysis on TCGA data using the R survival package. After using the survdiff function, I get that one group of patients has a higher expected value (Expected) than its group size (N):survdiff output

Has anyone encountered this behaviour, or can suggest why it happens?

r survival tcga
• 1,646 views • link
updated by Kevin Blighe Kevin Blighe • written by nimrodrap • nimrodrap

1 answer

Hello, yes, I have seen this before. The expected values are weighted, which is why they can sometimes be more than the observed and total number of events. This page goes over the calculations: https://mcardle.wisc.edu/mstat/help/help/Notes-07.html

Kevin

• 0 views • link
written by Kevin Blighe Kevin Blighe

Log in to answer this question.

More posts like this