[R] Problem with survival

[Frank E Harrell Jr]

Terry Therneau wrote:
>  It is likely a problem with survival, since
>  	2.9 merged in a large number of changes that had occured in my source 
> tree that had not propogated to the R tree
>  	
>  	my test suite doesn't have a test for this particular case (2 factors)
>  	
>  	and - Murphy's law applies: although almost every possible case is 
> covered in the test suite, any new error will hit an omitted combination of 
> options with high probability.
>  	
>  I won't get to it for a few days though.  As with other errors it will result 
> in both a fix and an addition to the test suite.
>  
>  Thank you for a clear explanation of the problem.  
>  
>  	Terry T.
>  	
> 
> Dieter Menne wrote:
>  "Make sure that this is really a problem with different versions of R,
> not a problem of different versions of survival which was changed recently,
> without backward compatibility, so that for example many function of
> Design (Harrell) do not work currently."
> 
>   The comment about backwards compatability is a little unfair.  The code for 
> survival curves post Cox model finally added the (long requested) ability to 
> accomodate case weights.  This added an argument to a C routine.  The Design 
> package called my C routine directly. I was not aware of this, there is no 
> promise in any R package that the not-meant-to-be-called-by-others C routines 
> won't change, Frank H was told about this as soon as we found out, and he's 
> working on it.

Exactly, and Thomas Dupont is modifying our code to take advantage of 
weights.  Thanks Terry.  -Frank

> 
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-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University