status indicator for time: 0 for censored observations and
1 otherwise.
group
a factor with levels "Chemotherapy+Radiation" and
"Chemotherapy".
Details
A clinical trial comparing chemotherapy alone versus a combination of
chemotherapy and radiation therapy in the treatment of locally advanced,
nonresectable gastric carcinoma.
Note
There is substantial separation between the estimated survival distributions
at 8 to 10 months, but by month 26 the distributions intersect.
Source
Stablein, D. M., Carter, W. H., Jr. and Novak, J. W. (1981). Analysis of
survival data with nonproportional hazard functions. Controlled
Clinical Trials2(2), 149–159.
References
Moreau, T., Maccario, J., Lellouch, J. and Huber, C. (1992). Weighted log
rank statistics for comparing two distributions. Biometrika79(1), 195–198.
Shen, W. and Le, C. T. (2000). Linear rank tests for censored survival data.
Communications in Statistics – Simulation and Computation29(1), 21–36.