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proportion
2006 Mar 31
1
andersen plot vs score process or scaled Schoenfeld residuals to test for proporti0nal hazards
Dear all,
I use the Andersen plot to check for proportional hazards assumption for a
factor (say x) in the Cox regression model and obtained a straight line that
pass through the origin. However, the formal test done by the R-function
cox.zph, which is based on the plot of Schonefeld residuals against time,
indicates that proportional hazards assumption is violated. Further, a plot
of the score