Sample Size Calculation for Cox (Proportional Hazards) Regression

[shakabra09]

I am having trouble understanding why the 'coxreg' option in proc power doesn't work for me. Everything I have read said to use that option to in order to determine the number of events needed, when I have an estimate for the HR and power that I want the study/analysis to have. Is it available anymore? If not, what other options are there in SAS to calculate this? I am using SAS 9.4 TRS Level 1M2. Windows Version 6.1. 

proc power;
     coxreg;
run;

proc power;
     onesamplefreq;
run;

Obviously the code above is not complete, but in my program 'coxreg' from the first example is red (meaning it's not recognized, unlike the 'onesamplefreq' option below it).

[Reeza]

 program 'coxreg' from the first example is red (meaning it's not recognized, unlike the 'onesamplefreq' option below it).

That's not necessarily true. The editors just not smart enough sometimes. 

[shakabra09]

From my log:

1 proc power;
NOTE: Writing HTML Body file: sashtml.htm
2 coxreg
------
180
ERROR 180-322: Statement is not valid or it is used out of proper order.

I should have included this in my original post...

[Reeza]

What version of SAS/STAT do you have?

proc product_status;run;

 Or how about the demo code:

proc power;
   coxreg
      hazardratio = 1.4
      rsquare = 0.15
      stddev = 1.2
      ntotal = 80
      eventprob = 0.8
      power = .
   ;
run;

[shakabra09]

What version of SAS/STAT do you have?

proc product_status;run;

13.2

 Or how about the demo code:

proc power;
   coxreg
      hazardratio = 1.4
      rsquare = 0.15
      stddev = 1.2
      ntotal = 80
      eventprob = 0.8
      power = .
   ;
run;

---

10   proc power;
11      coxreg
        ------
        180
ERROR 180-322: Statement is not valid or it is used out of proper order.

12         hazardratio = 1.4
13         rsquare = 0.15
14         stddev = 1.2
15         ntotal = 80
16         eventprob = 0.8
17         power = .
18      ;
19   run;

[shakabra09]

It looks like that is my problem, SAS/STAT 13.2 doesn't support coxreg. I need to make sure I use that User's Guide. Thank you!

[Reeza · Accepted solution]

http://support.sas.com/documentation/cdl/en/statug/67523/HTML/default/viewer.htm#statug_power_toc.ht...

Unfortunately SAS / STAT 13.2 doesn't have COXREG as an option. 

If you have a valid maintenance license, upgrades are free.