Question

survival analysis using R

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7.9 years ago

rsabrina93 ▴ 10

mrna_grade_surv<-coxph(Surv(Survival,Vital_status)~Grades,conf.type="none")
Error in Surv(Survival, Vital_status) : Time variable is not numeric

what do i do?

R • 4.0k views

ADD COMMENT • link updated 7.9 years ago by Devon Ryan 104k • written 7.9 years ago by rsabrina93 ▴ 10

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Survival    Vital_status
-0.0328549  0
-0.0328549  0
-0.0328549  0
0.0328549   0
0.0657098   1

this is the sample data.

ADD REPLY • link updated 7.9 years ago by Devon Ryan 104k • written 7.9 years ago by rsabrina93 ▴ 10

score 0 · Answer 1 · 2017-01-19

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7.9 years ago

Jean-Karim Heriche 27k

Most likely, you should convert your time variable to a numeric type. It could be as simple as using as.numeric() but it depends on what type your data is.

ADD COMMENT • link 7.9 years ago by Jean-Karim Heriche 27k

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I did that. but the curve is not right. but earlier when I did the analysis with the same code it worked. why not for this.?

ADD REPLY • link 7.9 years ago by rsabrina93 ▴ 10