rats2

48 rats were injected with a carcinogen, and then
  randomized to either drug or placebo.  The number of tumors ranges
  from 0 to 13; all rats were  censored at 6 months after randomization.

datasets

survival

Contains the core survival analysis routines, including
definition of Surv objects,
Kaplan-Meier and Aalen-Johansen (multi-state) curves, Cox models,
and parametric accelerated failure time models.

Terry Therneau

Survival Analysis

rats2 function

<table><tr><td>
    rat:</td>
<td> id</td>
</tr><tr><td>
    trt:</td>
<td> treatment,(1=drug, 0=control) </td>
</tr><tr><td>
    observation:</td>
<td> within rat</td>
</tr><tr><td>
    start:</td>
<td> entry time</td>
</tr><tr><td>
    stop:</td>
<td> exit time</td>
</tr><tr><td>
    status:</td>
<td> event status, 1=tumor, 0=censored</td>
</tr></table>

rats2: Rat data from Gail et al.

Description

Usage

Arguments

Format

rat:	id
trt:	treatment,(1=drug, 0=control)
observation:	within rat
start:	entry time
stop:	exit time
status:	event status, 1=tumor, 0=censored