S-phase fraction of tumor cells in breast cancer patients.
data("sphase")This data frame contains the following columns:
S-phase fraction
recurrence free survival
censoring indicator: FALSE means censored,
TRUE is an event.
The data have been used to address the question whether a simple cutpoint in S-phase fraction can be used to discriminate between patients with good and bad prognosis (for example in Hothorn & Lausen, 2003).
Torsten Hothorn & Berthold Lausen (2003). On the Exact Distribution of Maximally Selected Rank Statistics. Computational Statistics & Data Analysis 43(2), 121--137.