PROC LIFETEST is run with the STRATA= statement to compare survival curves between two treatment arms. By default, which test does PROC LIFETEST report?
Select an answer to reveal the explanation.
Short Explanation and Infographic
Here's the deal — b is correct because PROC LIFETEST produces the log-rank test by default when STRATA= is specified. The log-rank test weights all time points equally and is most powerful when the hazard ratio is constant (proportional hazards) over time.
Full explanation below image
Full Explanation
B is correct because PROC LIFETEST produces the log-rank test by default when STRATA= is specified. The log-rank test weights all time points equally and is most powerful when the hazard ratio is constant (proportional hazards) over time. A is wrong; t-tests are not valid for censored survival data. C is wrong; the Wilcoxon test requires TEST=WILCOXON to be specified. D is wrong; likelihood ratio tests come from PROC PHREG or PROC LIFEREG.