The concordance index C and the Mann-Whitney parameter Pr(X>Y) with randomly censored data.

@article{Koziol2009TheCI,
  title={The concordance index C and the Mann-Whitney parameter Pr(X>Y) with randomly censored data.},
  author={James A. Koziol and Zhenyu Jia},
  journal={Biometrical journal. Biometrische Zeitschrift},
  year={2009},
  volume={51 3},
  pages={467-74}
}
Harrell's c-index or concordance C has been widely used as a measure of separation of two survival distributions. In the absence of censored data, the c-index estimates the Mann-Whitney parameter Pr(X>Y), which has been repeatedly utilized in various statistical contexts. In the presence of randomly censored data, the c-index no longer estimates Pr(X>Y); rather, a parameter that involves the underlying censoring distributions. This is in contrast to Efron's maximum likelihood estimator of the… CONTINUE READING