I developed a model using Cox proportional hazards regression. I would like to obtain the c-statistics using Uno's method. I would like to know how to code to obtain the 95% confidence interval. This is the code I have that provides me only with the Uno's c-statistics.
In the given example, it would be 0.1584*1.96 = 0.3105
Lower limit = 0.5464 - 0.3105 = 0.2359
Upper limit = 0.5464 + 0.3105 = 0.8569
Thus if rounded 0.55 (0.24, 0.86) or expressed as % then 54.6 (23.6, 85.7).
Hope this helps.
Ashutosh
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