[R] Sorting Surv objects

[Professor Bickis]

Thanks for the quick response.  

My work-around was suggested as a quick fix for right-censored data, not as a general sort method for censored data.

My concern was that sort does not work on right-censored data as described in the xtfrm documentation.

Mik Bickis

> On Feb 13, 2015, at 05:53 AM, Therneau, Terry M., Ph.D. <therneau at mayo.edu> wrote:
> 
> Your work around is not as "easy" looking to me.
> 
> Survival times come in multiple flavors: left censored, right censored, interval censored, left-truncated and right censored, and multi-state.  Can you give me guidance on how each of these should sort?  If a sort method is added to the package it needs to deal with all of these.
> 
> Professor Ripley has pointed out that the default action of sort() for right censored times, which I agree is reasonable.
> 
> Terry Therneau (author of the survival package)
> 
> 
> On 02/13/2015 05:00 AM, r-help-request at r-project.org wrote:
>> It seems that Surv objects do not sort correctly.   This seems to be a bug.  Anyone else found this?
>> 
>>> >survival.data
>> [1] 4+ 3  1+ 2  5+
>>> >class(survival.data)
>> [1] "Surv"
>>> >sort(survival.data)
>> [1] 2  1+ 4+ 3  5+
>> 
>> An easy work-around is to define a function sort.Surv
>