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xxIRT (version 2.0.1)

Practical Item Response Theory and Computer-Based Testing in R

Description

An implementation of item response theory and computer-based testing in R. It is designed for bridging the gap between theoretical advancements in psychometric research and their applications in practice. Currently, it consists of five modules: (1) common item response theory functions, (2) estimation procedures, (3) automated test assembly framework, (4) computerized adaptive testing framework, (5) multistage testing framework. See detailed documentation at .

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Install

install.packages('xxIRT')

Monthly Downloads

237

Version

2.0.1

License

GPL (>= 3)

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Maintainer

Xiao Luo

Last Published

April 13th, 2017

Functions in xxIRT (2.0.1)

freq

Count Frequency
irt_model

Create IRT Models
irt_stats

Compute IRT Statistics
model_3pl

3PL Model
estimate_3pl

Estimate Both People and Item Parameters
estimate_items

Estimate Item Parameters
irt_rescale_3pl

Rescale 3PL parameters
irt_select

Subset IRT Model
estimate_people

Estimate People Parameters
estimationHelper

Estimation Helper Functions
catHelpers

CAT Helper Functions
ata

Automated Test Assembly (ATA)
ataHelpers

ATA Helper Functions
cat_sim

Computerized Adaptive Testing (CAT) Simulation
mst_sim

MST Simulation
rmse

Compute Root Mean Square Error
mst

Computerized Multistage Testing (MST)
mstHelpers

MST Helper Functions