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groupnum
2008 Dec 28
1
cox regression warning/error messages
Hello,
I am hoping for some advice regarding warning/error messages I
received when running a Cox regression
# message 1 - obtained while creating a plot of residuals
> plot (NV.zph, main = "groupNUSM - UNFIT", var= 'groupNUSM')
Warning messages:
1: In approx(xx, xtime, seq(min(xx), max(xx), length.out = 17)[2 * :
collapsing to unique 'x' values
2: In approx(xtime, xx, temp) : collapsing to unique 'x' values
Ques 1- A plot is generated, is there a solution to th...