It is known that the Brier score of a perfect predictive model is 0 while the Brier score of a trivial model is 0.25. However, can I make the same interpretation when looking at a model's integrated brier score (IBS)? Definitions provided by this library.
Also, how do I interpret a model with an IBS of >0.25? What if the concordance index of a model is >0.7 but its IBS is >0.25?