Dear all:

I have one question regarding application of syntax (svy) to cox regression.

After using "svyset" to set sampling error and stratum and using weighing option when doing "stset", I planned to apply "svy" to a cox regression, which has robust option.

In this regard, the syntax is:

svy: stcox predictor_1 predictor_2 ... predictor_N, vce(robust)

(Note: the reason I put "robust" is that: I have to use Andersen-Gill model to deal with recurrent events)

But, after typing that syntax, I got the following message: "option robust not allowed with the svy prefix"

May I have your favor to figure out this question?

Thank you very much