[R] Meaning of pterms in survreg object?

David Winsemius dwinsemius at comcast.net
Thu Jan 27 22:08:00 CET 2011

You got a perfectly sensible reply from Thereau,  the author of the  
package,  a day after your posting and then failed to respond to his  
questions. I'm not sure what more you are expecting.


On Jan 27, 2011, at 3:43 PM, Johannes Huesing wrote:

> Is there a special mailing list for the survival package where my
> question would have been more appropriate?
> Johannes Huesing <johannes at huesing.name> [Mon, Jan 10, 2011 at  
> 09:26:37PM CET]:
>> I am trying to model survival data with a Weibull distribution
>> using survreg. Units are clustered two apiece, sometimes receiving
>> the same treatment and sometimes opposing treatment.
>> Residual and predict methods are not carried out on the survreg
>> object, although the component linear.predictors exists for the
>> survreg object. Looking at the code I see that the residual method
>> refuses to run if any of the components of the pterms vector is
>> equal to 2.
>> When taking the logarithm of the data and trying a linear mixed
>> model, residuals and predicted values are produced just fine.
>> So what is pterms and why is it that, when any component of it
>> is 2, residuals are not allowed to be displayed?
>> -- 
>> Johannes Hüsing

David Winsemius, MD
West Hartford, CT

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