The IRT ProcedureOverviewGetting StartedSyntaxDetailsExamplesReferencesDetails: IRT ProcedureSubsections:Notation for the Item Response Theory ModelAssumptionsPROC IRT Contrasted with Other SAS ProceduresResponse ModelsMarginal LikelihoodApproximating the Marginal LikelihoodMaximizing the Marginal LikelihoodPrior Distributions for ParametersFactor Score EstimationModel and Item FitItem and Test informationMissing ValuesOutput Data SetsODS Table NamesODS GraphicsCopyright © SAS Institute Inc. All rights reserved.