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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?

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See equation 20 in this paper "https://jmlr.org/papers/volume21/18-772/18-772.pdf".The IPCW version of the integrated brier score indeed could be greater than the uncensored version because the denominator is smaller than 1.

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