[R] survfit & number of variables != number of variable names

[Georges Dupret]

This works ok:

> cox = coxph(surv ~ bucket*(today + accor + both) + activity, data = data)
> fit = survfit(cox, newdata=data[1:100,])

but using strata leads to problems:

> cox.s = coxph(surv ~  bucket*(today + accor + both) + strata(activity),
> data = data)
> fit.s = survfit(cox.s, newdata=data[1:100,])

Error in model.frame.default(data = data[1:100, ], formula = ~bucket +  : 
  number of variables != number of variable names

Note that the following give rise to the same error:

> fit.s = survfit(cox.s, newdata=data)
Error in model.frame.default(data = data, formula = ~bucket + today +  : 
  number of variables != number of variable names

but if I use data implicitly, all is working fine:
> fit.s = survfit(cox.s)

Any idea on how I could solve this?

Best, and thank you,

ge




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