Value of Information
Overview
Value of information (VOI) asks whether an observation, question, experiment, or computation is likely to improve a decision enough to justify its cost. Bayesian decision theory measures expected utility gains from sample or perfect information, while related methods use entropy reduction, regret, or risk bounds to guide experimental design, POMDP exploration, diagnosis, and clarification. Approaches range from dynamic programming and expected value of sample information calculations to Monte Carlo estimation, learned question policies, and certified rules for allocating sensing or computation. Across settings such as robotics, health sensing, retrieval-augmented generation, and language-agent interaction, a central challenge is that reducing uncertainty is not automatically useful: information must change actions for the better, given its costs and risks.
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