What measure do I use to compare nested models and non nested models in high dimensional survival analysis [D]

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So, Im a bachelor student and for my thesis I would be comparing multiple high dimensional survival models for the same. My professor asked me what measure would I use for accuracy of nested models and in non nested models. Im unable to find any answer on the internet, Please tell me the accurate measure to evaluate the same. Thank you submitted by /u/baelorthebest [link] [comments]