Re: [R] negative Somers D from Design package

For the Cox model Dxy is the rank correlation between predicted log hazard and time to event. As a high hazard means that the time to event is short, you need to negate Dxy for your purpose. Frank North, Bernard V wrote: Dear R help My problem is very similar to the analysis detailed here.

[R] negative Somers D from Design package

Dear R help My problem is very similar to the analysis detailed here. If we use the mayo dataset provided with the survivalROC package the estimate for Somer's Dxy is very negative -0.56. The Nagelkerke R2 is positive though 0.32. I know there is a difference between explained variation and predi