complete class theorem in decision theory

E212554

The complete class theorem in decision theory is a foundational result that characterizes optimal decision rules by showing that any admissible rule belongs to a "complete class" beyond which no better procedures exist.

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complete class theorem in decision theory canonical 1

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Statements (47)

Predicate Object
instanceOf result in statistical decision theory
theorem in decision theory
appliesTo estimation problems
general statistical decision problems
hypothesis testing problems
associatedWith Abraham Wald
statistical decision theory of Wald
characterizes Bayes rules as forming a complete class under regularity conditions
clarifies relationship between admissible and Bayes decision rules
concerns admissible decision rules
complete classes of decision rules
domination of decision rules
loss functions
optimal decision rules
risk functions
field Bayes rules
surface form: Bayesian decision theory

decision theory
mathematical statistics
statistical decision theory
hasConsequence Bayes procedures are often sufficient for optimality analysis
inadmissible rules can be discarded without loss of optimality
search for optimal rules can be restricted to a complete class
hasFormulationCondition regularity conditions on loss and risk functions
topological conditions on parameter and action spaces
historicalContext developed in the mid-20th century
implies admissible rules form a complete class under suitable conditions
isRelatedTo Bayes optimality
Statistical Decision Functions
surface form: Wald’s decision theory

admissibility theorem
minimax theorem in decision theory
mathematicalNature non-constructive existence result
relatesTo Bayes rules
dominated decision rules
generalized Bayes rules
minimax decision rules
requires comparison of risk functions across all parameter values
roleInPractice guides restriction of attention to admissible or Bayes rules
roleInTheory foundational result in decision theory
states every admissible decision rule belongs to some complete class
no decision rule outside a complete class is better in terms of risk for all parameter values
usesConcept action space
admissibility
complete class
decision rule
parameter space
prior distribution
risk domination

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Full triples — surface form annotated when it differs from this entity's canonical label.

Abraham Wald developedConcept complete class theorem in decision theory