From edward.m at psu.ac.th  Wed Dec 12 03:15:08 2007
From: edward.m at psu.ac.th (edward.m at psu.ac.th)
Date: Wed, 12 Dec 2007 03:15:08 +0100 (CET)
Subject: [Rd] Adding a survival object to a data frame (PR#10510)
Message-ID: <20071212021508.D18A92834155@mail.pubhealth.ku.dk>

Full_Name: Edward McNeil
Version: 2.6.1
OS: Windows
Submission from: (NULL) (203.170.234.5)


I want to show students how the survival object looks like in R.
Reproducible example:

library(MASS)
data(Aids2)
attach(Aids2)
status <- status=="D"
stime <- death-diag
surv <- Surv(stime, status)
D <- data.frame(stime, status, surv)
head(D,20)
   stime status x..i..
1    176   TRUE   176 
2     67   TRUE    67 
3    432   TRUE   432 
4     77   TRUE    77 
5    275   TRUE   275 
6    373   TRUE   373 
7    389   TRUE   389 
8   1027   TRUE  1027 
9    492   TRUE   492 
10   434   TRUE   434 
11    16   TRUE    16 
12   308   TRUE   308 
13    92   TRUE    92 
14   265   TRUE   265 
15  1052  FALSE  1052+
16   132   TRUE   132 
17   527   TRUE   527 
18   581  FALSE   581+
19   511  FALSE   511+
20   151   TRUE   151 

detach(Aids2)

The 'surv' column is strangely labelled 'x..i..'.



[Rd] Adding a survival object to a data frame (PR#10510)
edward.m at psu.ac.th