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Table 5 Survival probability statistical test summaries

From: Statistical learning methods as a preprocessing step for survival analysis: evaluation of concept using lung cancer data

Model Test Chi-Square DF p-value
Accepted     
Dichotomous Age over Strata Log-Rank 4.1784 1 0.0409
  Wilcoxon 3.4073 1 0.0649
Dichotomous Age and Gender over Strata Log-Rank 12.7383 3 0.0052*
  Wilcoxon 13.5117 3 0.0043*
Hybrid     
Dichotomous z over Strata Log-Rank 22.7597 1 < 0.0001
  Wilcoxon 14.9418 1 0.0001
Dichotomous z and Gender
over Strata
Log-Rank 28.1863 3 < 0.0001*
  Wilcoxon 22.4886 3 < 0.0001*
  1. The statistical tests findings for the various age an z related survival probability curves are provided with the degrees of freedom (DF). When comparing more than two survival curves (*), the hypothesis that all the curves were the same was tested against the alternative that at least one curve was different.