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
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
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.