Post-hoc power analysis for Cox regression

[Manije72]

Hi,

I want to do post hoc power analysis for Co regression. I want to calculate power in SAS for cox regression. I can find the hazard ratio and confidence interval from other studies. How can find R square and standard deviation for these code 

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

[ballardw]

Proc Power is intended to do pre-study planning, not post hoc power analysis.

From the online help:

Overview: POWER Procedure

Power and sample size analysis optimizes the resource usage and design of a study, improving chances of conclusive results with maximum efficiency. The POWER procedure performs prospective power and sample size analyses for a variety of goals, such as the following:

• determining the sample size required to get a significant result with adequate probability (power)

• characterizing the power of a study to detect a meaningful effect

• conducting what-if analyses to assess sensitivity of the power or required sample size to other factors

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