error : 'Neither concordance nor ROC analysis is performed with the START/STOP specification'

[km0927]

Hi. i'm using 'proc phreg' to perform time-dependent survival analysis.

I'm trying to get harrell's c index, using 'concordance' option. like this.

proc phreg data=test concordance plots=roc;

class variable1(ref='1') variable2(ref='1') variable3(ref='1')

model (start, stop)*censored(0) =  variable1 variable2 variable3/TIES=

EFRON RL;

RUN;

However,  'Neither concordance nor ROC analysis is performed with the START/STOP specification' appears in log screen.

Results of survival analysis came out normally, but 'harrell's c index' didn't came out.

[FreelanceReinh · Accepted solution]

Hi @km0927,

It seems that there are limitations in PROC PHREG regarding ROC analyses (and hence the c statistic) under certain circumstances, including time-dependent analyses (of some sort): see this thread:

https://communities.sas.com/t5/SAS-Statistical-Procedures/Concordance-index-for-Competing-risks-PROC...

and perhaps this unanswered question: https://communities.sas.com/t5/SAS-Statistical-Procedures/How-to-create-ROC-curves-using-PROC-PHREG/....

[km0927]

thanks. maybe SAS doesn't support 'Harrell's c index concordance option' in time-dependent survival analysis....