# Testlet Item Response Theory

## Documentation for package ‘tirt’ version 0.4.0

- DESCRIPTION file.
- User guides, package vignettes and other documentation.

## Help Pages

binary_irt | Binary (Dichotomous) Item Response Theory Estimation Using Likelihood or Bayesian
dif | Differential Item Functioning (Mantel-Haenszel and Logistic Regression)
ela1 | Mixed-Format English Language Arts (ELA) Assessment Data (Form 1)
ela2 | Mixed-Format English Language Arts (ELA) Assessment Data (Form 2)
ela3 | Large-Scale Mixed-Format English Language Arts (ELA) Assessment Data (Form 3)
ela3_testmap | Large-Scale Mixed-Format English Language Arts (ELA) Assessment Data Testmap (Form 3 Testmap)
equate_irt | Item Response Theory Equating / Linking
fixed_item | Fixed Item Calibration
fix_person | Fixed Person Calibration with or without Covariate
irt_trt | Joint Item Response Theory and Testlet Response Theory Estimation (Dichotomous & Polytomous)
item_fit | Item Fit Statistics (Infit and Outfit)
item_info | Item Information Function
ld_stats | Local Dependence Statistics (Yen's Q3)
mirt_binary | Multidimensional Binary Item Response Theory Estimation
mixed_irt | Mixed Item Response Model Estimation (Dichotomous & Polytomous) with Prior Support
mixture_irt | Mixture Item Response Theory Model (Latent-Class Rasch / 2PL)
person_fit | Person Fit Statistics (Standardized Log-Likelihood, lz)
polytomous_irt | Polytomous Item Response Theory Estimation Using Likelihood or Bayesian
reliability | Test Reliability Indices
score_table | Summed-Score to Theta Conversion Table
sim_irt | Simulate Item Response Theory Data
sim_mirt | Simulate Multidimensional Item Response Theory Data
sim_tirt | Simulate Mixed IRT and Testlet (TRT) Data
sim_trt | Simulate Testlet Response Theory Data (Vector Supported Version)
tcc | Test and Item Characteristic Curves (Expected Scores)
test_info | Test Information Function and Conditional Standard Error
trt_binary | Unidimensional Binary (Dichotomous) Testlet Response Theory Estimation
trt_poly | Unidimensional Polytomous Testlet Response Theory Estimation