[R] Expected number of events, Andersen-Gill model fit via coxph in package survival

Terry Therneau therneau at mayo.edu
Mon Oct 22 14:19:22 CEST 2012

Therneau doesn't know the answer either.
The predictions are positively correlated since they all depend on the same beta-hat from 
the original model.  The same will be true for any model: logistic, poisson, linear, ...

Terry T

On 10/20/2012 06:06 PM, Omar De la Cruz C. wrote:
> I have a follow-up question (for either Dr. Therneau, or anybody who
> might know).
> sum(zz) (see below) estimates the number of events for the cohort.
> Now, how can I compute a confidence interval for sum(zz)? Or a
> standard error?
> My obvious choice, square root of the sum of the squares of the
> standard errors for zz provided by predict.coxph, turns out to be too
> small.
> Thank you for any suggestions.
> Omar.

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