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Dec 3, 2020 at 5:20 history edited Thomas Lumley CC BY-SA 4.0
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Dec 3, 2020 at 5:20 comment added Thomas Lumley That's right. The baseline hazard isn't needed to estimate $\beta$ but it is needed to estimate survival curves.
Dec 2, 2020 at 8:00 vote accept Matthew Hui
Dec 2, 2020 at 7:53 comment added Matthew Hui Thanks a lot for your help. So it looks like individual $\hat{H}(t; z)$ is based on the non-parametric device, $\hat{H}_0(t)$, as well as the results from Cox regression $e^{\sum \beta z}$.
Dec 2, 2020 at 6:10 history answered Thomas Lumley CC BY-SA 4.0