Computing Subscores in Classical Test Theory and Item Response Theory

Functions for computing subscores for a test using different methods in both classical test theory (CTT) and item response theory (IRT). This package enables three sets of subscoring methods within the framework of CTT and IRT: Wainer's augmentation method, Haberman's three subscoring methods, and Yen's objective performance index (OPI). The package also includes the function to compute Proportional Reduction of Mean Squared Errors (PRMSEs) in Haberman's methods which are used to examine whether test subscores are of added value.


Reference manual

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3.1 by Shenghai Dai, a year ago

Browse source code at

Authors: Shenghai Dai [aut, cre] , Xiaolin Wang [aut] , Dubravka Svetina [aut]

Documentation:   PDF Manual  

Task views: Psychometric Models and Methods

GPL (>= 2) license

Imports cocor, boot

Depends on CTT, stats, irtoys, sirt, ltm

See at CRAN