Testing log-linearity

Q&A

New Member
#1
Hi all,

I want to test the log-linearity assumption for a cox model.
How to interpret the plot of martingale residuals? you need to have a horizontal plot, or a linear line, or ...
In which case should the hypothesis be validated and in which case should it not be validated?
 

Q&A

New Member
#3
Yeah that sounds right, horizontal projection of residuals. Post your figure.
Ok thanks if it's horizontal it's validated.
For exemple, if is it a curve that goes up and down or the opposite?
How to interpret it? What to do? Should we reject the hypothesis?
 

hlsmith

Less is more. Stay pure. Stay poor.
#4
Well nothing is perfect, think about a Q-Q plot. So given it isn't out of control it is likely assumed horizontal.