Survival Analysis & Cox Regression

Kaplan-Meier and Nelson-Aalen Estimators

  • The most common estimator of the survival function was introduced by Kaplan and Meier (1958)1. This estimator is referred to as the Product-Limit estimator.
  • Aabel also provides Nelson-Aalen estimator of survival function.
The Analysis Output

The analysis output can include:

  • Life table
  • Survival curves (to which can be added 95% pointwise confidence intervals)
  • Logrank significance test report

Nelson-Aalen Survival Analysis

Nelson-Aalen survival Curve: Estimated Disease-Free Survival for 137 Bone Marrow Transplant Patients*.

* Source of data: Klein, John P. and Moeschberger, Melvin L. (2005). Survival Analysis: techniques for Censored and Truncated Data. Second Edition. Statistics for Biology and Health. Springer.

Kaplan-Meier Survival Curves From Analysis of Diffuse Large Cell Lymphoma Data*


Kaplan-Meier Survival Analysis of Two Gene Expression Subgroups


Kaplan-Meier Survival Analysis of undifferentiated data

  • (a): The survival curve form analysis of data splitted by levels of gene expression subgroup.
  • (b): The survival curve form analysis of undifferentiated data.

* Source of data:; DLCL (diffuse large cell lymphoma) Survival data.