About nchesnaye

nchesnaye · ‎10-30-2014

Hi all, I am currently using Cox to estimate the hazard ratio of death in control vs treatment groups. However, there is an interaction with follow-up time and hazard ratio, with the HR initally being higher and crossing '1' after approx. 2 years of follow-up. I would like to visualize this changing HR by plotting the HR as a function of time. Is this possible in SAS? Second question, am i correct in saying that the proportional hazards assumption is violated? I have attached an example of what I am trying to achieve (attached PDF, figure 1B). Thank you in advance for your help! Kind regards, Nick

nchesnaye · ‎08-27-2014

I played around a bit to get the right bandwidth and now it's perfect! Thank you for your help!

nchesnaye · ‎08-26-2014

Hi Xia, Thanks for your reply. Your syntax provides the log of negative log of survival, which looks very much like the cumulative hazard. What I need though is to plot the 'instantaneous' hazard against time. In other words, the risk of the event occuring / hazard rate / failure rate at any given time. I am also not sure how to translate the log of negative log of survival scale to hazard on the y-axis.

nchesnaye · ‎08-26-2014

Hi, I would like to plot hazard curves using proc phreg. I know proc lifetest is capable of this, but i need the 'entry=' option (for left-truncated data) which is provided only by proc phreg. Is there anyway I can get the hazard function using phreg (smoothed if possible)? Thanks! Kind regards, Nick

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How to plot non-parametric hazard ratios over time

Re: Hazard curves using proc phreg?

Re: Hazard curves using proc phreg?

Hazard curves using proc phreg?

How to plot non-parametric hazard ratios over time

Re: Hazard curves using proc phreg?

Re: Hazard curves using proc phreg?

Hazard curves using proc phreg?