You can make predictions if you assume that you are in (weighted) randomly selected world. Well rather than a single world, I think that the perceived identity

You can make predictions if you assume that you are in (weighted) randomly selected world. Well rather than a single world, I think that the perceived identity exists in multiple highly similar and interacting worlds seen as an entity. Just like we have a size in physical space we also have a non-zero "size" in probability "space".