From P.Dalgaard at biostat.ku.dk  Wed Dec 12 16:23:15 2007
From: P.Dalgaard at biostat.ku.dk (Peter Dalgaard)
Date: Wed, 12 Dec 2007 16:23:15 +0100
Subject: [Rd] Adding a survival object to a data frame (PR#10510)
In-Reply-To: <20071212145020.098072834620@mail.pubhealth.ku.dk>
References: <20071212145020.098072834620@mail.pubhealth.ku.dk>
Message-ID: <475FFCE3.70500@biostat.ku.dk>

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..'.
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>>     
>
>   


-- 
   O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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[Rd] Adding a survival object to a data frame (PR#10510)
Peter Dalgaard