data from Section 1.5
btrial data frame has 45 rows and 3 columns.
This data frame contains the following columns:
Time to death or on-study time, months
Death indicator (0=alive, 1=dead)
Immunohistochemical response (1=negative, 2=positive)
Klein and Moeschberger (1997) Survival Analysis Techniques for Censored and truncated data, Springer. Sedmak el al. Modern Pathology 2 (1989): 516-520.
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