cindex equal 0

[tcoroller]

File "/home/corolth1/torchsurv/src/torchsurv/metrics/cindex.py", line 568, in _p_value_noether
raise ValueError(
ValueError: The standard error of concordance index must be a positive value.

[melodiemonod]

Hi @tcoroller ,

I don't think the edits proposed are correct because it would lead to a division by 0 (

torchsurv/src/torchsurv/metrics/cindex.py

Line 590 in 57845ed

(self.cindex - null_value) / cindex_se

).

The se should not be 0. Do you want to give me a reproducible code so I can check the error you got?

[tcoroller]

Sounds good, let me try to do a reproducible example

[tcoroller]

Unless we can do something like:
(self.cindex - null_value) / (cindex_se + eps) ?

[melodiemonod]

I mean intuitively the c-index standard error should never be 0. I'm curious to know what can can lead to this!