Description Usage Arguments See Also Examples
Graphical tool which in a series of 5 graphs let us compare how well data are explained by the estimated proportional hazards model with nonrobust (black color) and robust method (green color). The first graph gives standardized difference of two estimated survival functions; one via the Cox model and the other via Kaplan Meier estimator. The following four graphs show the same differences for four strata, defined by the quartiles of the estimated linear predictor. Comparison of estimation results along with analysis of the graphs leads frequently to a very detailed information about the model fit (see examples).
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x 

caption 
captions to appear above the plots. 
xlab 
title for the x axis. 
ylab 
title for the y axis. 
main 
overall title for the plot. 
... 
other parameters to be passed through to plotting functions. 
color 
if 
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