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  • $\begingroup$ I am going to add fixed effects such as age, this is just my starting point. In what situation would you use the second type of PHREG with the entry statement? $\endgroup$ Commented Nov 16, 2017 at 19:01
  • $\begingroup$ @ScottJackson it is a data formatting issue, the SAS syntax is nebulous to me. If you have time varying covariates, you must transpose from a wide format to a long format, so that there are one or possibly two rows of data for each participant. The t1 survival time should be 0 for non-truncated, or the difference between start-of-observation (2003) and transplant date or operation date for truncated entry. $\endgroup$ Commented Nov 16, 2017 at 19:22
  • $\begingroup$ Right, you can do it that way but there's also a shortcut where you can use a programming statement within PROC PHREG like I wrote. Thanks for the help. $\endgroup$ Commented Nov 16, 2017 at 19:32