I have a continuous variable X with which I ran Cox proportional hazards. The outcome was 1=Death, 0=censored/still-alive. I have an odds ratio 0.516 for this predictor.
1) How do I interpret that hazard ratio? For every unit increase in X there is 0.516 more times chance of dying?
2) How can I plot a graph of the survival function (or death rate), with Variable X in the x-axis? (please state specific procedures/software that can do that). I was thinking of using the modal value of my explanatory variable and see the death % within that subset, and then start extrapolating from there using the odds ratio, unit-by-unit, in order to build a table of x-y values for the graph.
Thank you.
Hi,
Kindly refer the attachment.
Thanks.
http://www.pitt.edu/~super4/33011-34001/33091-33101.ppt
Hi,
Within the R environment, there are many functions for modeling such an scenario (Cox PH model) and make a survival plot. To begin with, the "coxph" function of the "survival" package will work fine (I refer you to the package's vignettes for a tutorial).
Anyway, Cox models do not produce OR: their results will be hazard ratios (not the same, take a look at the definition).
I hope that I have helped you.
Regards! :)
http://en.wikipedia.org/wiki/Hazard_ratio
http://cran.r-project.org/web/packages/survival/index.html
yes thank you. Sorry I meant Hazard Ratio, not odds ratio. I understand the distinction between those two.
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