What's included
📊
Item Analysis
Classical test theory statistics including p-values, point-biserial correlations, distractor analysis, and reliability estimates.
⚙️
Item Calibration
Full IRT calibration engine supporting 1PL, 2PL, 3PL, GRM, GPCM, PCM, and RSM via marginal maximum likelihood with EM and Gauss-Hermite quadrature.
🎯
Scoring
IRT-based ability estimation with EAP, MAP, and MLE methods. Full support for polytomous and mixed-format tests.
🧩
Cognitive Diagnostic Models
DINA, DINO, and G-DINA calibration and scoring for diagnostic classification and skill mastery profiling.
🔗
Equating & Linking
Six equating methods including Stocking-Lord, Haebara, Mean/Sigma, and Mean/Mean for linking test forms to a common scale.
🏗️
Test Construction & Assembly
Automated test assembly powered by Google OR-Tools CP-SAT solver. Blueprint constraints, TIF optimization, item groups, and simultaneous multi-form assembly.
🔍
DIF Analysis
Differential item functioning detection using Mantel-Haenszel and standardized mean difference statistics across focal and reference groups.
👥
Multigroup Calibration
Bock-Zimowski multigroup IRT for concurrent calibration across multiple populations with group-specific ability distributions.
IRT
CDM
CTT
DIF
Equating
Test Assembly
Multigroup
PDF Reports
PACER University