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emreliability (version 1.0.0)

Test Reliability and CSEM in Educational Measurement

Description

Provides functions for computing test reliability and conditional standard error of measurement (CSEM) based on the methods described in the Reliability in Educational Measurement chapter of the 5th edition of "Educational Measurement" by Lee and Harris (2025, ISBN:9780197654965).

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Version

Install

install.packages('emreliability')

Version

1.0.0

License

MIT + file LICENSE

Maintainer

Huan Liu

Last Published

December 17th, 2025

Functions in emreliability (1.0.0)

lord_wingersky

Lord-Wingersky Recursive Formula
normal_quadra

Gaussian Quadrature Points and Weights
kr21

KR-21
stratified_alpha

Stratified Cronbach's Coefficient Alpha
spearman_brown

Spearman–Brown Prophecy Formula
csem_lord

CSEM Lord Method
alpha

Cronbach's Coefficient Alpha
csem_binomial

CSEM and CSSEM with Binomial Model
cssem_polynomial

Polynomial Method for CSSEM
ct.u

Conversion table for unidimensional data.
csem_lord_keats

CSEM: Lord Keats Method
csem_compound_binomial

CSEM, CSSEM, and Reliability under the Compound Binomial Model
csem_info

CSEM of IRT Model via Information
stratified_feldt

Stratified Feldt's Coefficient
ct.m

Conversion table for multidimensional data.
data.m

Multidimensional data
rel_info

Marginal Reliability of a Unidimensional IRT Model
info

Information for IRT Model
feldt

Feldt's Coefficient
rel_test

Test Reliability and CSEMs for IRT Scores
ip.u

Item parameters for unidimensional data.
data.u

Unidimensional data
kr20

KR-20