Adding a survival object to a data frame (PR#10510)

ripley at stats.ox.ac.uk wrote:

Your example is not reproducible without 'library(survival)'.
When I include that, I get

head(D,20)

    stime status  surv
1    176   TRUE  176
...

Objects of class "Surv" are from the contributed package survival, and you
need that attached to deal with them properly.

... but even if you detach it, you do not get the symptoms shown:

head(D,5)

  stime status surv.time surv.status
1    176   TRUE       176           1
2     67   TRUE        67           1
3    432   TRUE       432           1
4     77   TRUE        77           1
5    275   TRUE       275           1

On Wed, 12 Dec 2007, edward.m at psu.ac.th wrote:

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..'.