[R] syvcoxph and cox.zph for testing the PH assumption

[Youyi Fong]

Hello, is it kosher to call cox.zph on a syvcoxph model fit? I see that
someone proposed a modified version of cox.zph that uses resid(fit,
'schoenfeld', **weighted=TRUE**).

https://stats.stackexchange.com/questions/265307/assessing-proportional-hazards-assumption-of-a-cox-model-with-caseweights
Is that all it takes?
Thanks,
Youyi

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