Test Reliability and CSEM in Educational Measurement
Cronbach's Coefficient Alpha
CSEM and CSSEM with Binomial Model
CSEM, CSSEM, and Reliability under the Compound Binomial Model
CSEM of IRT Model via Information
CSEM: Lord Keats Method
CSEM Lord Method
Polynomial Method for CSSEM
Feldt's Coefficient
Information for IRT Model
KR-20
KR-21
Lord-Wingersky Recursive Formula
Gaussian Quadrature Points and Weights
Marginal Reliability of a Unidimensional IRT Model
Test Reliability and CSEMs for IRT Scores
Spearman–Brown Prophecy Formula
Stratified Cronbach's Coefficient Alpha
Stratified Feldt's Coefficient
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).