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The IRT Procedure
Overview
Basic Features
Getting Started
Syntax
PROC IRT Statement
BY Statement
COV Statement
EQUALITY Statement
FACTOR Statement
FREQ Statement
GROUP Statement
MODEL Statement
VAR Statement
VARIANCE Statement
WEIGHT Statement
Details
Notation for the Item Response Theory Model
Assumptions
PROC IRT Contrasted with Other SAS Procedures
Response Models
Marginal Likelihood
Approximating the Marginal Likelihood
Maximizing the Marginal Likelihood
Factor Score Estimation
Model and Item Fit
Item and Test information
ODS Table Names
ODS Graphics
Examples
Unidimensional IRT Models
Multidimensional Exploratory and Confirmatory IRT Models
Multiple-Group Analysis
Quality of Life Survey
References
Details: IRT Procedure
Subsections:
Notation for the Item Response Theory Model
Assumptions
PROC IRT Contrasted with Other SAS Procedures
Response Models
Marginal Likelihood
Approximating the Marginal Likelihood
Maximizing the Marginal Likelihood
Factor Score Estimation
Model and Item Fit
Item and Test information
ODS Table Names
ODS Graphics
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