The impact of heterogeneity on the comparison of survival times.

@article{Schumacher1987TheIO,
  title={The impact of heterogeneity on the comparison of survival times.},
  author={Martin Schumacher and M. Olschewski and C. Schmoor},
  journal={Statistics in medicine},
  year={1987},
  volume={6 7},
  pages={773-84}
}
We consider several sources of heterogeneity in a clinical trial with patients' survival time as the main response criterion: differences in prognosis which can be attributed to a latent or ignored prognostic factor; differences in treatment efficacy in subgroups of patients, and differences in treatment combinations received by the patients. The impact of these types of heterogeneity on the treatment comparison is studied assuming a proportional hazards model. It is measured by the size and… CONTINUE READING

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