Stata 15 help for irt

[IRT] irt -- Introduction to IRT models

Description

Item response theory (IRT) is used in the design, analysis, scoring, and comparison of tests and similar instruments whose purpose is to measure unobservable characteristics of the respondents. This entry discusses some fundamental and theoretical aspects of IRT and illustrates these with worked examples.

Binary response models

irt 1pl One-parameter logistic model irt 2pl Two-parameter logistic model irt 3pl Three-parameter logistic model

Categorical response models

irt grm Graded response model irt nrm Nominal response model irt pcm Partial credit model irt rsm Rating scale model

Multiple IRT models combined

irt hybrid Hybrid IRT model


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