[R] Meaning of pterms in survreg object?

Terry Therneau therneau at mayo.edu
Tue Jan 11 14:35:57 CET 2011

I'm having a hard time fathoming your question, since "pterms" appears
nowhere in my source code to residuals.survreg.  Can we start at the
beginning, per the posting guide?

 1. What version of R are you running?
 2. What exactly are the statements you typed which give the message?

Note that residuals are not saved in a fit, but are computed later.
  fit <- survreg(Surv(time, status) ~ age + height, data=mydata)
  resid(fit, type='response')

Terry Therneau

--- begin included message --------
Residual and predict methods are not carried out on the
object, although the component linear.predictors exists for
survreg object. Looking at the code I see that the residual
refuses to run if any of the components of the pterms vector
equal to
--- end inclusion ---

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