Question: CBioPortal LogRank P value for Kaplan-Meier curve

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araksuj •

**0**wrote:Can someone explain in detail about the formula that is used to calculate the logrank test p value for the Kaplan Meier curves under survival? I am trying to write a script where I can input a list of genes and then output a list of pvalues for the Kaplan-Meier curves for mutations in those genes. I am able to get the kaplan-meier curve for each of the genes in the list but I'm not getting the right p value so I was wondering if there is some formula that is used to calculate it.

Before proceeding, can you define what you believe to be 'the right p value'?

41kBy right p value, I mean the p value that appears on the CBioPortal Website next to the Kaplan Meier curve when you query for a gene and a cancer

0Okay. This should show you how you can obtain various P values from survival analysis: A: cox proportional hazard model

41k