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Answers
https://courses.nus.edu.sg/course/stacar/internet/st3242/handouts/notes3.pdf
You can install the package coxph from CRAN to add it in.
Here's the full list of survival analysis add-ins.
https://cran.r-project.org/web/views/Survival.html
I found this guide on how to use coxph here: http://stat.ethz.ch/R-manual/R-patched/library/survival/html/coxph.html
Good luck!