but for real-life cases, how could accurate estimates of P(A|X) be obtained?
In order of (decreasing) reliability: through science, through expert consensus, through crowd-sourcing, through personal estimates.
but what exactly IS a world-model?
Simply the set of sentences or events declared true. For a world-model to be useful those sentences are better to be relevant, that is, can be used to derive probabilities of the questions at hand.
In order of (decreasing) reliability: through science, through expert consensus, through crowd-sourcing, through personal estimates.
Simply the set of sentences or events declared true. For a world-model to be useful those sentences are better to be relevant, that is, can be used to derive probabilities of the questions at hand.