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OCR: Tests Between Groups When there are multiple groups the Tests Between Groups table shows statistical tests for homogeneity between the groups Tests Between Groups Test Chi-Square DF Prob>ChiSq Log-Rank 1227 0.0772 Wilcoxon .6510 0.1035 Test names two statistical tests of the hypothesis that the survival functions are the same across groups Chi-Square gives the Chi-square approximations for the statistical tests .The Log -Rank test places more weight on larger survival times and is most useful when the ratio of hazard functions in the qroups being compared IS approximately constant. The hazard function is the instantaneous failure rate given time also called the mortality rate or force of mortality The Wilcoxon test places more weight on early survival times and is the optimum rank test if ...