coxph with tt and id gives error

[tgbrooks]

Running coxph using both the tt and id parameters gives an error

Error in residuals.coxph(fit2, type = "dfbeta", collapse = cluster, weighted = TRUE) :
  Wrong length for 'collapse'

For example (gives error with version 3.2.13):

bladder1 <- bladder[bladder$enum < 5, ] 
coxph(Surv(stop, event) ~ (rx + tt(rx) + size + number),
      id = id, bladder1,
      tt = function(x,t,...) x*t)

If this is not allowable use, it would be nice to have a more understandable error and some mention of this in the documentation of coxph. It looks like the work around is to also specify cluster = id. Is there any problems with doing that?

[therneau]

I will take a look at this. I have never tried using id and tt in the same model myself, nor had anyone ever ask about this edge case before.

[therneau]

Now fixed in my code; a simple oversight.