I have a question about Cox's partial likelihood approximations in "coxph"
function of "survival package (and in SAS as well) in the presence of tied
events generated by grouping continuous event times into intervals.
I am processing estimations for recurrent events with time-dependent
covariates i
Thomas Lumley-2 wrote:
>
> [...]
>
> The warning and error messages are correct here. Look at the point
> estimate. It's a log hazard ratio of about 20 in one case and about
> -20 in the other case. The true partial maximum likelihood estimator
> is infinite. The estimated standard errors are
Terry Therneau-2 wrote:
>
> This query of "why do SAS and S give different answers for Cox models"
> comes
> up every so often. The two most common reasons are that
> a. they are using different options for the ties
> b. the SAS and S data sets are slightly different.
> You have bot
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