[R] pooled hazard model with aftreg and time-dependent variables

[JPF]

This is for coxph:

The cluster term is used to compute a robust variance for the model. The
term + cluster(id) where each value of id is unique is equivalent to
specifying the robust=T argument, and produces an approximate jackknife
estimate of the variance. If the id variable were not unique, but instead
identifies clusters of correlated observations, then the variance estimate
is based on a grouped jackknife. 

How could be done using aftreg? and/or phreg?

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