[R] How to understand the plotting of the cox.zph function

Jim Trabas jim.trabas at googlemail.com
Tue Sep 6 16:59:01 CEST 2011

Thank you very much for your answer.

I would like to construct for presentation purposes the HR(t), not the
beta(t). How can I perform this? 

I obtained the x-y values of the cox.zph plot 

time= as.numeric(as.character(rownames(cox.zph.object$y)))

However when I plot the plot(time, HR) and fit a lowess line (to time, HR),
the HR seems to jump over proportionally high (higher that what the cox.zph
plot suggests)

Am I making any error in my thinking?

Many thanks

View this message in context: http://r.789695.n4.nabble.com/How-to-understand-the-plotting-of-the-cox-zph-function-tp3788886p3793651.html
Sent from the R help mailing list archive at Nabble.com.

More information about the R-help mailing list