Under a credal set, EVPI is concave so its lower envelope is generator-exact and its upper needs an LP, while Gamma-maximin VOI can exceed the whole classical envelope and is a distinct estimand.
Felli and Gordon B
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Value of Information under Imprecise Probabilities: Decision-Rule-Specific Values and Fixed-Measure Envelopes on a Credal Set
Under a credal set, EVPI is concave so its lower envelope is generator-exact and its upper needs an LP, while Gamma-maximin VOI can exceed the whole classical envelope and is a distinct estimand.